If Goku could achieve a state that even Destruction Gods have problem reaching, does that mean Jiren is literally more powerful than Destruction Gods?
yup. Whis heard rumor about a mortal that even a GoD cannot defeat. U11 GoD probably trained Jiren to surpass him. or by chance, discovered Jiren has an ability that can counter and overwhelm a GoD, and found that of value to improve upon for any unforseen circumstances. and besides the Tournament of Power happened before, so they were planning ahead for this tournament.
of course it's unproven if Jiren could defeat all the GoDs, but at least the GoDs of the 8 universes that participate in the current tournament.
if Goku's Ultra Sayian mode made Beerus sweat, and Jiren's aura overwhelmed Beerus, Jiren might be a step or two above the GoDs not from the strongest universes.
so there could be tiers of
the other Angels
upper tier GoDs
lower tier GoDs
it's unknown what tier Zeno Guards are. surely they aren't just for show.