I misunderstood, though I did read it all.
Here's the thing, and
@Jon Nellis pointed it out. Jon's DPV's are engineered in such a way that they almost seem too good to be true in terms of their raw power and efficiency. His tail cone design is disgustingly good. He is also 100% correct that something like a Black Tip will struggle in JB if it is pumping, and you will struggle to get through the lips at Ginnie, etc. I say struggle because it is comparably powerful to a UV18/26. You will still make forward progress, but probably around 100fpm max from my experience in those caves with a UV26...
I would have no problem using the Blacktip in the caves if you're learning cave DPV and you are not barreling back to 5,000ft. One thing that hasn't been mentioned that will again piss Jon off, but so be it, is what some of my buddies do when they have to fly in. Just rent a big primary for $100/day. Buy something like a Black Tip for diving caves like Little River, Twin, if much of Hole in the Wall, or other lower flow/shorter cave systems, and if you plan on barreling back to the end of JB, or doing a bunch of diving in one day, or whatever, then rent something like a Genesis from
@Superlyte27 or whatever other big primary scooter you want to rent and let them eat that cost. If you buy a Blacktip for $2k, and you rent a Genesis/Magnus/Seacraft/Bonex/Suex/whatever else for 60 diving days, you have the same $8k invested as if you bought one of those scooters but all of those big dives were done with a backup scooter that increases your safety factor while cave diving, and you get a cheap/small/good enough DPV for use when running around at home.
If you're committed to big cave dives now, then buy a real scooter, but if you look at the math above, I just can't recommend in good conscience that you buy an exploration grade scooter. Is it better? No doubt, but you have to decide for yourself if the $6k is worth it. It's literally whether one of those scooter is 3-4x better than the Blacktip. If we had this discussion a year ago? Very different ballgame, but this little thing literally broke the entire DPV market.