With a non-greek organization, what grows back after a 2 year absence is very different from what was there before. What grows back after a 4 year absence is ... nothing. I imagine the national frats have a process for starting new houses, so I suppose PiKAs and KDRs will continue to be themselves when they come back, but will they care about Buggy any more than PiKAs at other schools do?
But they'll hit their first Carnival with one recruiting class worth of members, with zero experience running their old buggy program and one semester of being a coherent house. Sure, they'll have a fleet of black buggies, and alumni who know everything about them. Having been in that situation, I can say that still isn't easy - there's a bunch of "common sense" that every new mechanic, chairs, and probably push captains, learn from their predecessors, that seems so obvious that nobody thinks about it. Without it, you end up rediscovering many "how could anyone possibly screw up _that_ way" mistakes (c.f. Kappa, PhiKap).
Through blind luck, CIA restarted with a group of mechanics & drivers who got along with their alumni, and who realized quickly that there were "known unknowns" that we could never learn from the alumni. Some of the early Spirit guys may say similar things, at least when drunk.
Unless PiKA recruits from other teams, or has alumni involved to an inappropriate level, this is going to be tricky for them at first. At least their alumni have time to plan for it. And they won't be looking at the actives wondering "who are these idiots and what have they done with my team!?"
Plus, it will be 4 years since the most recent alumnus last did Buggy. I have yet to meet a former mechanic from any team who hasn't said, "man, I'm surprised that we go away with what we did. If I have to do that now I'd do something safer/more reliable/less half-assed." Learning from alumni with post-buggy experience might lead the new FOADs to be more conservative than if they'd learned from upperclassmen. This has certainly had a negative effect on CIA over the last decade. Hopefully PiKA is smarter or has a more comprehensive big black book of buggy lore.