If only he played against those teams every week, eh? To be fair, I do think he has what it takes to be a success at the top level, but not turning up against Villa, Forest, Fulham etc would be concerning if looking to sign a player to compete week-in-week-out at the very highest level.
To be...
As others have said, the problem Trossard has is that he openly covets a big move and, although being ambitious is no bad thing, he just isn't consistent enough to be appealing to the big boys. People talk about Chelsea but they have Sterling, Pulisic, Ziyech, Felix, Gallagher, Havertz and now...