I think you feel if a team isn't playing City style football then the team doesn't have a working system. When you have pace up front you utilize it, its part of the working system. And yes playing well for Brighton isn't the same as doing it for United or Chelsea but he did show at Brighton the talent to do so.
And you have to understand the sort of mess Chelsea were last season. With an owner playing real life FM. A dressing room which literally couldn't contain the number of players with a lot of them knowing they wouldn't be there after the season and down tooling, three separate managers in one season. Its difficult to judge a player in such circumstance. Plus it's only going to be a loan deal to coveer for our injuries so we can judge him here ourselves.