Whitney's artist page already has a song with this combo in it. That artist page's trend is to have her w/ 'featured artists' (she's the seiyuu for a character & others work with her on the music) and there's another song with these two there now, so I'm going with this solution.
...Buuuut, Brendan Milburn is an established artist. Had there not been a song page with this combo in it (& several others on ID 10564 with different 'featurings' already), there could have been a separate collaboration page.
In other words, what the artist's doing - in this case, voice acting - has to be considered sometimes, then a judgment call based on their past work, among other things, is made. Yes, keeping it all sensible can be crazy sometimes...because - editing.
If I wasn't an insomniac, I'd go back to bed. All that shoveling today demolished me. I just need a long rest. I'll answer other posts after that. Very likely at 3 am - or later.