It works for what he needs, what more do you want. Not many do that to Kingsbury, Manuwa hit him with everything and he kept in there... Fabio Maldonado one of the best boxers in the division and Glover landed everything he threw.
What he's needed so far was to fight low level fighters. He isn't technically that great or intelligent. Maldonado isn't the best boxer in the division. Neither of these guys have proven themselves at top level of the division. Rampage may seem declining and unmotivated but he's gone through WAY more quality competition and done well and has rarely if ever been bested purely in boxing.
If Glover comes in sloppy like he did against Maldonado Rampage will make him pay.