Dana White is kind of a cuck in terms of the type of fighter he wants. Remember he hated Roy Nelson, loved Brock Lesnar. Contender Series is a nice way for him to make squash matches for overhyped guys who look athletic and explosive. He thinks that UFC will only be a legitimate mainstream sport if it looks the part.
He then gives favorable matchups to these guys in the UFC and lets them stick around through multiple losses if necessary. It's like Kevin Holland. Every time he loses, they set him up with a scrub. This is almost unfathomable: He is 7-2 in the UFC and, quick, name his best win... Nobody who even belongs on a main card, I can tell you that.
It's not hard to see what Contender Series is for. It's not for finding the best fighters.