Why should we loan him out again? He is turning 22 this year, he's had a fantastic season, this is his time to step on the next level. Even if Boro qualifies for PL they will fight against relegation which is not optimal for a young striker. I hope we'll bring him back and he can take his chance. Training with world class players and play 15-20 games for Chelsea could be benefitial for him. Signing Ade would be pointless IMO.