Michael Inoa - SP
As stated earlier in the thread his name should be Ynoa. Form BP, "He was Michel (pronounced MEE-shell) Inoa when he signed, but he has since added an "a" to his first name and is now going by the more anglicized pronunciation while also correcting the past misspelling of his surname."
After reveiwing numerous scouting reports on Inoa, I find no mention of him throwing a slider. I do find mention of him throwing a splitter however. From BA, "He also flashed a splitter". I also found mention of it in the scoutign reports below. Again, nothing on the slider though.
His fastball is first for sure, followed closely by his curve. His change and Splitter should be 3rd and 4th. Here are the scouting reports that I used along with BP and BA.
Scouting Report: Michel Inoa | SaberScouting
Inoa, 16, at head of Latin American prospect class - MLB - ESPN
BaseballAmerica.com: Prospects: International Affairs: A's Take Lead In Inoa Sweepstakes
Trevor Cahill - SP
I think you need to up his velocity. Ba has him sitting at 88-92 with his two seamer and 94 with his 4-seam fastball, while BP has him in the low 90's and hitting 95. Right now in the roster he is at 87-89 velocity, I think he should be in the 92-94 or 93-95 range to balance out the velocity on his sinker and give him a proper top end on his 4-seamer. His knuckle curve rates as a plus-plus pitch by BP and "nasty" by BA. Should be clearly a better pitch than his change and slider. BA says, "he has another tough breaking ball in a low-80's slider with cutter like action at times". Finally, "Cahill's changeup should becoem an average pitch, but he'll need to throw it more against higher-caliber competition."
Right now all his pitches are rated at 152 in both current and potential. there needs to be a definite delineation amongst his pitches. His Sinker is his best, followed closely by his knuckle curve, his slider would be next, with his change-up last. As BA states, his change-up isn't fully developed yet and should grow into an AVERAGE pitch, I would at max put it's potential at 120, with a current rating in the mid 90s.
Brett Anderson - SP
Also throws a sinker. BA says it sits at 88-92 with the sinker and 94 with the 4-seamer. BP has it at 88-91 and the 4-seamer topping out at 95. I would put it at the same level that you end up putting Cahill's. Like Cahill he is also primarily a sinkerballer, so it should be rated highly. Also, I would flip the ratings on his curveball and slider, as his curve is supposed to be a bit better.
Chris Carter - 1B
I'm guessing you grabbed the wrong position data off of minor league splits.com. The stats on that site are for chris carter of the red sox, and show him at 1B and LF as you have in the roster. In actuality, the A's Carter, has played 1st, 3rd, and RF. That being said he is below average at all of those positions. If I had to choose a position I would put him at 1b as his primary. He does have a strong arm, but his defensive deficiencies come in his range and fielding. I would boost his arm but drop his range and error. His power potential is off the charts, and that is reflected accurately in the roster.
Gio Gonzalez - SP
His curveball is far-and-away his best pitch. From BP, "Gonzalez has average-to-plus velocity and can touch 94 mph, but he uses the fastball primarily to set up a plus-plus curveball that's among the best in the system due to its considerable break and a bit of horizontal movement." From BA "His best pitch is a 75-78mph curveball with sharp break and two-plane depth". On the other hand, his change-up is his worst pitch although BP says it is "improving". I would just flip his pitches around so that the curve is best, fastball 2nd, and change 3rd. So curve in the 160-180's, fastball maybe in the 100-130 range, and change in the 70-80 range with a potential in the low 100's.
Vincent Mazzaro - SP
He pitches off of his fastball. His fastball/sinker/cutter should be higher rated than his slider and change. He also throws a curve, but it is more of a show-me pitch. So his ratings should go FB/SNK/CUT, slider, change, curve. His curve should probably be in the 50's, change-up 60-70, slider-80's, and his fastball/sinker/cutter should be much higher. Some scouts rate his sinker even above Cahill and Andersons, so make sure it is at least close to theirs.