Yes, he is on loan. By the way, Golovin is starting to show his talent, that's a good sign.
Quite a while I didn't watched Monaco.
Let me make the point. Gelson is dumb as a rock but has pace and even if he can be frustrating he probably will assist a lot of players even if he misses a shitload of them.
Adrien knows Jardim but it was 5 years ago they worked together, while Carlos Vinicius is a raw talent who can be developed and used as a alternative option to Falcão. Porto was interested on him and if I am not wrong he belongs to Napoli who signed him from a second tier club here in Portugal.
You are right about Golovin and I will add Fabregas or even Lopes coming back will help.