It’s a combination of both, it’s not binary, it’s not one or the other. Sanchez was awful in his last 6 months at Arsenal - we hoped that was a blip, but it’s not looking like it. Lukuku has never been able to score goals against the big teams he is the absolute definition of a flat track bully - and unfortunately that really highlights his limitations at a striker.
Jose is a defensive manager, but other strikers and attacking players have thrived under him previously. We’ve just had a baby, and the last time Lukuku scores at home in the PL we weren’t even pregnant! He did come 6 weeks early, but it highlights how utterly poor he’s been.