I think Burns matches up stylistically well with Colby, depending on how the grappling would go. I don't see submissions from bottom helping him out, but if Burns's grappling fights off Colbys wrestling or if he pushes the takedowns himself, I think he wins. Granted, Colby throws a lot more volume, so I'd expect him to get a lot of his (weak) strikes in, which Gil would have to be careful not to lose rounds for, but he should win overall.
Not so easy to just say Burns matches Colby everywhere, though. The styles are very different, and there's people Colby would have an easier time with than Burns