This can be confusing.

If a player tries an early cup or cock, the club can go way inside causing an over the top swing or some other bad result. If you do not roll the wrists/forearms, then no you would not take it too far inside
I would think that many players would not know the difference between cupping and cocking. Devices are sold to maintain a straight left wrist (RH player), so presumably the left wrist does not cup. The RH wrist does cup fully. The cocking action is presumably the movement of teh wrist that takes place at 90 degrees to teh cupping action. hold hand staright up and move it side to side, that is cupping, move it up/down, that is cocking, pretty simple

I am sure that this is all very clear to some and could be made very clear to you given the right teacher

I have read the stuff on the Golf machine sites (Manzella, Crocker) - they get into cupping an cocking and takeaway in some detail. But even they distinguish between diferent types of swings - Hitting vs Swinging for example. They know you cup before you cock. I can hit and swing and in both the cup comes before the cock, TGM knows that. If you guys only knew the amount of "top 50" instructors who are TGM, and the amount of tour players they teach you might be suprised. Their knowledge in general is MUCH higher then pga

I change my swing at least once or twice a year, but when I look back at videos we have taken over the years, the swing always looks the same
I have decided to do the best I can with what I've got. If I can cut 3 or 4 puts out of each game and get up and down 75% of the time, I will be a scratch golfer. Not likely, but easier to work on go find yourself a tgm instructor, you might be suprised at what you can learn. I have only changed my set up and a couple of minor things in my golf swing and now most all my problems are fixed. if some of you guys lived near orlando I would fix you for free just for the challenge of it.