Correct. Honestly, I'd have to say that some of UK's recent posts suggest he's lost touch with the 3.5E mechanics and wouldn't be very helpful in a conversion effort- at least for the mechanical parts of it. The RP part, of course, and the background of the beasts in case we need to just invent new things to capture the essence of the intent (since 4E is so radically different mechanically from 3.X or PF), he'll be very helpful for.No, I mean for mechanics (and format, but that's incidental to the question I'm asking). Pathfinder is an improvement over v.3.5 in pretty much every way, and where possible I think it'd be helpful to try and use that for any IH back-conversions (e.g. using Perception instead of Spot and Listen, giving them a CMB and CMD instead of a grapple bonus, etc).
I have some recent and current experience with Pathfinder, including significant work done within the last few months converting and updating my old campaign setting to use it. So I'm all for just targeting PF for the conversion and ignoring 3.5 altogether (or at least to begin with).