if you promise a start, the likely result of trying to redshirt will be a drop in WE to 1 - possible he will transfer - and I think it will be a broken promise
if you hit the redshirt button before he signs, that nullifies the start - but if costs $$ and erases its positive recruiting effect
I have signed a guy for $100 when that was all I had left and he was way low for my team's prestige