Honestly, it's up to you.
If your 18 year old is worthy of a U-20 team, then you are likely hurting his chances. Other than that, you are slowing down his training.
"hurting" is relative. You are likely helping your team with 2 position training but slowing down the 18 year old's training a bit.
So, its up to you to decide which is more important. Everyone has a different strategy.
Last edited by FresRez at 4/6/2016 11:04:07 PM