You are saying that lacazette keeping dembele out and scoring and assisting almost one a game should be a worry for signing dembele because the French league is BS so lacazette as numbers should almost be discounted. (Dembele scored 3 in 800 mins.. better than 1 in 3 full games of footy fyi,)
following your rationale the arsenal kids stats should also be discounted because he plays in the same pony league.
Ever considered lacazette wasn’t suited to arsenals style, and finally he is back in a team that plus to his strengths?