doesn't matter. he either is or is not a first hand witness. it looks like he is in fact a Pfizer head of development, and would likely have access to the information he spoke about. if that's true, then he is a good witness, unless he's completely fabricating it. that's the question. at the very least, Congress should subpoena Pfizer to find out if what he said was true .
it is irrelevant if he chose the PV channel to blow the whistle. for a number of reasons it is probably the best way to go about it. gives him a high profile now and less likely to be suicided….