We have to remember he's 21.
He's shown in isolated games he can defend, and attack - it's on Everton to develop him and bring some consistency.
He has age on his side, not sure when Coleman is back but he will be plugged straight back into the team is my guess.
Patterson reminds me of Coleman , going forward is not the issue but defensively some concerns and that loan spell to Blackpool was the making of him. Patterson needs games and 6 months or season in the Championship would be easier for him to ply his trade than the baptism of fire that is the premier league.