The thing about the draft is that you only get 3 pretty random and generally not very good players.
If however you save 40k every week you get a fair chunk of money that you can then use to buy a fantastic new trainee.
Once you have 1 trainee you can start focussing on getting them minutes each week. Once you save a bit more you can by a respectable trainee to train as the backup.
Obviously training 3 in a single position is possible but hard to minute manage.