Much more effective than Trincao but with addition of Depay and rehab of Anu he needs regular playing time that unfortunately Koeman gave too little of last season. Here, a loan makes sense but absolutely with a buyback
I "always" said he can do what Dembele does, but probably better.
I think I didn't see him before last preseason, but he showed there that he is as fast as anyone playing football, ridiculous.
He then got two 20-minute-appearances this season under the manager that is so so good with playing youngsters... Well he didn't impress, but who can blame him? Give him the 2700min Dembele got and I think he'd very well score 10 goals as well.
Trincao is a bit of a different type, and at the moment I think he is a bit superfluous to this squad.
edit: I mostly agree with those above as well - he isn't better than Tello, and they should cash in on him - but to better cash in they need him to have played and scored some first