this can partly explain trumps
more than usual aggressive behavior. there was NOT any agreement before the debate with respect to earpieces-- bidens team did not agree to those terms (nor the drug test, of course).
if bidens team was feeding him information, the only way trump could shake him up was to keep the pressure on while biden was trying to listen to his cues. i think this is more of a reason why biden blurted out "would you shut up?" during the debate. when biden went on about the green new deal and then at the last second said, "i do not support the green new deal... i have my own deal" makes more sense now. his handlers probably straightened him out.
in any case, bidens team would be wise to use trumps pushiness and interruptive behavior as a reason NOT to have any other debates, claiming that there is no point to any other debates with him. biden has everything to lose with any further debates, and if the wire/contact lens info is correct, trumps team will be more prepared. i would find a way to interrupt/hijack/interfere with that signal; maybe send a high pitched whine through it, forcing biden to yank it out of his ear in front of the television audience.