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Hey, you’re not giving pentaborane enough credit - it’s got 4 of those bridging hydrides.

Yeah, amazing that something so relatively unstable can actually exist long enough to be dangerous. I suppose the exothermic output is not helped by how stable H2 is.

Do other molecules fit inside the cage?

no, far too small i would think. not sure what the smallest cage is that can act as a host-guest complex

https://en.wikipedia.org/wiki/Host%E2%80%93guest_chemistry

A fun one is Prof Rebek et al's 'tennis ball' - bisglycoluril that forms two halves that cup around a guest:

https://www.scripps.edu/newsandviews/e_20011203/rebek1.html