I don't think a Saibaman could solo the Bleach universe. Not because they're weak, but because from what I've seen, they have little to no ki control, and are therefore incapable of busting cities and moons.
Yes he can... Roshi destroyed a moon in DB and Piccolo the same with ease at a power level of 250+ yet Saibaman are 1000+... and they follows orders quite nicely... or else they would be useless for Vegeta at that time... Saibaman would destroy a city pretty easy... same with a moon..
Raditz stomps the Bleach verse... and the HST as well...
for those that say that Raditz wont be able to see anyone in Bleach... then you are wrong because Ki is from spirit energy and Raditz has plenty of it... and thus allowing him see and physically touch anyone in Bleach.... he is also faster than anyone in bleach as well... and can has more destructive power than anyone on Bleach.... a moon busting attack should end it all... which that would take about a few or even 1 second for Raditz to perform seeing how Piccolo destroyed the moon instantly.