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Where are you getting the information that the shooter bought his gun in January? From what I read, the Korean student's fingerprint was on at least one of the guns used in the killing, both were found in his possession, and there was a receipt for at least one of the guns, purchased in March.

I haven't seen any evidence that there were two shooters. From what I've read, the killings in the dorm were the first. Maybe he did plan to go on a full rampage, and just started with his ex-girlfriend and the Resident Assistant who came to help her in her argument with the killer. But the police responding to the first shooting didn't have any inkling that the killer had planned anything else, so they were not prepared for what he did next.