Creative, but kinda taking the long way around, isn't it?
For my ear, there's not enough bass guitar, especially in the chorus, and the snare could pop a lot better, this groove kinda demands a solid backbeat. I didn't hear any of the earlier versions, and don't know anything about the acquisition history.
There seems to be sort of a 1-2KHz "wall of sound" thing happening when it gets loud, too. I think it's the density of the background vocals and the fact that they sound so similar to the lead (it being the same person); but you can do things to differentiate it. If it were me, I'd be doing the following:
1) Cut back on the early reflections by about 20%, and I'd dry it out in general just a little. It's a lovely sounding reverb, but there's a disconnect between the lead vox and the rest of the band in terms of patina.
2) Bump the bass guitar up in the mix (at least during the chorus, maybe some automation like a volume envelope to make that happen), and add some 4Khz to give it some more definition.
3) Nudge the snare up in the mix too, 1.5-2dB at least, and fatten it up a little (125Hz)
4) Cut some of the midrange (500Hz-2KHz) out of the backup vocals, leaving their edge in so they still cut and make themselves present, but so that they don't quite take over the sound field so thoroughly.
5) The backup vocals in the 2nd verse are too big, they jump out in front of the lead too much.
6) There's a tiny little B3 sound happening in the final fade that I didn't even know was in the song till then; let that organ be heard somewhere!
7) The heavy midrange stuff I mentioned is mostly on the right side, and it makes the whole mix lean to the right a tad.
Things I like:
1) The imaging, especially the drums
2) The kick drum is solid, clean, just the right decay and a nice
thump.
3) The slide resonator guitar dancing in and out
4) The solid performances all around.
A lot of this is subjective/taste related. The mix is mostly clean.