I think we're both on the same page about these two players, talking about Gabriel Martinelli and Leandro Trossard. These two guys have how the contribute to the club but for Gabriel Martinelli he's good but you can't rely on him to get the job done when the club is facing a critical situation, he's always a switch off and on and you can't tell when he's at his best, plays well when you don't expect him to and plays bad when you don't think he would, I don't like such players, as for Leandro Trossard he can change the outcome of a game especially when he comes in as a sub, Arteta should have used him as his secret weapon.
When you said Leandro Trossard got his chance to start was when Gabriel Martinelli got injured, for me I think even when that happened Arteta still find it difficult to see Leandro Trossard as the best option. For Arteta to let the Belgium player go it only shows that all the wingers we saw Arsenal going for are not coming because he had already gotten his man which is Madueke. Let the Gunners continue to free up some space and let in better players to strengthen the squad but the major concern is this striker the are struggling to get.