Gagnon...
The ratings stay as is throughout the year(but game to game, I think there is a hot/cold "bonus" and also one with fatigue...but you can't see it)....it's after the season is done that you get to see the players progression/regression and the game uses points as the indicator. Usually an A potential player will get between +10-+20....with the bar it's hard to see where the CPU allocated those points, but I don't think(I'm going on memory here...and I'm OLD!

) I remember any one category getting huge jumps....so the edits don't get totally frayed from one year to the next.(especially on the older players)...but I'll do some testing again to confirm just how much it is....
The younger A/B potential players seem to make the more significant jumps also.
As for the new players coming in......it's usually 3 a team(and with retirements/FA signings...it might not even be three) so you're looking at maybe 90 edits per season.....with maybe half being pitchers(the tougher player to edit.
If you don't mind the fake names....then the edits can go very quickly.
I just keep my eye on speed...baserunning.....reaction(OF) and power(grows too quickly, so I hamper them at the start) and fielding.(this year...last year I only had to do speed/reaction)
I don't mess much with the pitchers at first because the hitters have the upper hand...usually in the third year I go into the pitchers.
Last year I had a chart that I kept of the rookies that had their names/teams and I just marked it YEAR 1...YEAR 2 and so on...(I got to 5

) and just gave them a little check when I edited them.
Sounds nuts...but it's pretty easy if you give yourself a system and stick to it(don't jump around)
M.K.
Knight165