When they are in solution yeah, otherwise ultrasonic vibrations won't help with anything. I am not sure how important sonication is, many are probably skipping that. I guess it depends on the compound, some compounds might readily complex with the HPBCD and others need the vibes to get 'shoved in'. With other surfactants that are not molecular traps I think it is less relevant anyway.
Actually I would go for a ratio of at least 3:1 of HPBCD : 25I, rather than what sekio said, since it has a molecular weight of about 3 times that of 25I so otherwise it would not even be stoichiometric. (The number of molecules would not even cover it).
Going for an excess (more / much more than the 3 parts HPBCD) though will seriously limit how much could fit in blotters because it all depends on the absorbency, and going over the saturation could cause crystallization on the blotter... that could be uneven which is potentially very dangerous.