1) Botín is a mono rating guy - be it IRC or V5, tuck the transom in a bit here, a hint of a chine there. At ETNZ / AC34, he was shunted to the VOR project, and we know the bitter aftertaste that left
2) For the AC62, we've even left "classic" multi design - epitomized by a VPP, balance of steady state propulsive and resistance forces - and gone (just like F1) to "vehicle dynamics", where what matters is the stability of foiling under transient conditions. As that certain person said, either you've mastered the basics in AC34 or you needn't bother ..
I have this to say about the mono guy vs multi guy discussion. Designing in the Americas Cup environment is very different in terms of what you can imagine, test, and build. There are so many examples of this, but consider the comments of Paul Bieker "most loaded structures I have ever designed" referring to foils in the 34th. Designers, even the chief, are a part the team framework and must either do their part (or make choices / set priorities of others work in the case of department heads/chief) rather than be solely responsible for coming up with the next big thing. AC teams are hierarchies.
I don't know Botin at all, but as a designer with a CONSISTENT record and big team experience, he is perfectly well suited to make design decisions. It is for this reason that I reject direct comparisons to JuanK. Same reason I reject blaming Botin for Clifford, as if he designed it by himself.
It is important to have enough intrinsic understanding of the "beast" in the team, just as it matters to listen to the sailing team. But AFAIK none of the design teams have been led, nor will be led, by the noted major players in the multihull field. In the case of e.g. the 33rd, my own opinion is that the previously mono AC designers (Fresh Burns etc.) chewed up and digested all of what VPLP had to offer in a very short amount of time, and then gave them something else to do. Didn't Pete Melvin coach the sailors from BMWOR? Long story short: naval architecture in multis is naval architecture first, multihulled second.
As for classic multi hull design vs foiling multihull and VPP, if you think that a VPP cannot handle transients at this level, well that is not the case. Flight simulation is also a force balance, as is a VPP. In the case of the AC, the solutions will be very customized.