If you buy high potential drafters and decide to train them and save money to buy top players when you finish training of those drafters, you need to know that in 2027 you will have a problem because you WILL BE PUNISHED for training players for years by losing games because of your team's poor stamina in relation to opponents who do not train players, but can do stamina training.
Sorry to fuel your anger but nah, what kinda nonsense is that. Get yourself a level 3 gym and a level 6 or 7 nutritionist and you'll see your player's stamina pop without even needing to train. Stamina receives cross training as well, so stamina will definitely not be much of a problem. You also don't really need proficient or prominent stamina unless you're planning to use 7 man lineups to compete.
Tho I do agree that a starting team shouldn't buy high potential trainees to train. After all they're not stable enough financially. High potential trainees are more expensive, hence they won't get a proper return on investment out of them, especially when they can't train them at full efficiency.