The suggestor should have that hand declared dead and time penalty
I agree..it is quite clearly softplay...and quite clearly unacceptable...I would never ever suggest something like that openly.
everybody checks it out or atleast if you bet it you tend to have the nuts (as hands are ussually shown when someone else is all in and you don't want to be caught bluffing in that situation)..but to suggest teaming up on someone is simply not on.