Obviously OJ bought the gloves and used them at the murder scene. Obviously OJ left at least one glove at the murder scene. The question is whether someone other than OJ could have moved the other glove from the murder scene to OJ's house.
Since the person who "found" the glove at OJ's house ended up with a perjury conviction, it is reasonable to at least question his credibility.
Questions of Fuhrman's credibility was Johnny Cochran's ploy to confuse the jury. It worked. But it was never proved that Furhman lied about any of the evidence. As for the glove, police were friendly with OJ; they had no reason to frame him. Moreover, for all they knew he was in some other state (which he was) where he could have been for many days which would 100% exclude him as a possible suspect. So why would a police detective plant a glove in the man's yard not knowing if it were even possible to frame him given he could have been out of state during the time the murders occurred? He wouldn't.
Also, Kato Kalin's testimony about hearing a bump against the house in the very spot where the glove was found lends credibility to the possibility that OJ dropped it when he jumped the fence into his own yard. That, again, is nothing police could have known at the time they were supposedly 'planting' the glove.