Sorry, I forgot to put up YT links of the concert for reference. I can't seem to find the video of Ken P but here's Mario.
[youtube]
http://youtu.be/FTZ2JLbmHzE[/youtube]
Credits. vanna meyelle
Mario's voice is a little too high pitched for my liking. It's okay when he talks but when he sings, that's another story. Ken doesn't sing with a lot of emotion nor does his voice have a lot of range. Of all the guys, I think James has the nicest voice and has the most control and ability/technique. Nadech probably has the best stage presence and versatility.
Those pairings were only my guesses/hopes na. Between the two girls, I think Taew has the better chance of being the guest considering the buzz of their current lakorn. A Supachai isn't on good terms with Baifern's personal manager even though Baifern herself is okay with him. I believe he finds work for her occasionally since she used to be under his management but I question whether he would promote Mario/Baifern's pairing.
Namtarn actually likes to sing. I won't necessarily say she's good but tolerable, depending on the song.
Here's a video. (She LOVES this song)
[youtube]
https://www.youtube.com/watch?v=NaywFXKqkzE[/youtube]
Credits: Dek Pichy
My instinct tells me that Chalida will be part of it and I can't think of anyone else that's associated with James besides her. It'd be a nice opportunity since she didn't end up being the guest during the 4+1 Concert. I don't think she's a good singer but if there's a chance to see her with James again, why not?
Weir - Mai Davika is another girl that's known to be his koo kwan but for sure it won't be her so I'm putting my hopes on Min.
I just realized that almost all the girls I mentioned were/are presenters for Mistine.