I'm sorry, are Kenny and Dowell playing the same positions as those guys? No.
They were pressed into the first team out of need.
I love Dowell as much as anyone and believe his vision and technique are excellent, BUT he's playing behind Ross, Davies, and even to some extent, Morgan and Gana. Should he play in front of any of these guys?
I also think we are getting a bit carried away with Kenny. He may indeed start, he may be better than Cuco, but I think his U20 performances are being pretty overblown. He has been very good, definitely good for a U20 world cup, but has not been perfect. The EPL is a completely different beast.
I also in no way, shape, or form endorse Cuco. But he's cheap, he can play both backs even if he was just RB this past year, and buys down risk at that position. Say what you want about Kelly, he'd be a risk and the idea of handing him that position without a backup - and Coleman isn't going to be ready tomorrow - is way too risky without any fall back plan.