It's said that Yusuke would have rivaled/surpassed Yomi in 3 years if he trained btw.
EoS YYH top/high tiers are very hard to place - my guess is that Yusuke and those of his level would be country level+ whereas the demon kings would be somewhat on the high-end spectrum of country level.
Which means Yusuke stops at Radditz who gets powerscaling from Piccolo's moon busting ki blast.
The kings would also stop at Radditz.
So yeah, they don't get past Radditz.