The timing on these meetings isn't entirely clear. We didn't hear word one about the Lovie and Marrone interviews until well after the fact, and the final 2 hours of the Browns meeting was dinner. It's entirely possible that by the time news broke of the Bills meeting with Kelly, it was already near completion. They very well could have met for a few hours considering it's now, what, 10pm in Arizona?
Having said that, I don't think it bodes well.