He did a solo or two on the record (Side 1 was minus the alto, Side 2 minus the tenor) and sounded pretty comfortable on the instrument. What was real fun was that in the "charts" for each tune, the solos were notated, so if you hear them on one side and wanted to play them on the other, there they were. Wilber's (he might have just had one, not sure, on a track called "Freemanition", a tribute to Bud Freeman) was/were easy to read, but Seldon Powell's, with their slippery bebop phrasing fully notated (more or less) were hard as hell, at least until the adjustment was made to use the ears more than the eyes.
Really, between the charts and the bios and the explanations of all the various tunes, that was a wonderfully educational play-along record, much more impactful than a simple rhythm section laying out changes for you to fuck up at will without necessarily hearing anything wrong. If ever anybody would take the two sides of the record and perfectly sync them up so that we could hear the full section with all solos (it's the same takes on each side), I'd be in for a copy. I mean, jeeezis, look at that line up, how do they not make for a great section. And on different tunes, you'd have different parts to play. If you covered both sides, you'd have had experience reading lead alto, 2nd alto, plus 1st & 2nd tenor parts. No skating along playing ead all the way, it really gave you experience in navigating harmony parts and voicings, all that good stuff that you don't really learn any other way than by playing in a section. It's becoming an increasingly irrelevant skill, but I still really enjoy hearing a good section.
Oh, the rhythm section was Dick Wellstood, George Duvivier, and Panama Francis. You could do worse...