Definitely think Lacazette is good enough for us, and I wanted him in the summer, but I'd rather an attacking midfielder with goals in him, and keep Alexis at CF. Really think Alexis at CF gets the best out of him, on the left he can be frustrating (especially when a stationary player like Giroud is there), actually prefer Alexis on the right if he's not in the centre, and even then, much prefer him in the centre.
I can see Lacazette going to United. I read that Mourinho wants to proven striker this summer. Can see him buying Griezmann and Lacazette.