Are you suggesting that you will believe the third bug guy but not the one hired by the prosecution or the one that backed him up?
No, my reference to real bug guy was intended to highlight that todays witness wasn't a bug guy but rather an expert in a different field.
I expect that Goff will tie together the missing pieces and be able to explain why the old two bug guys got there dates, why todays guy got his range and why the date should be back to the disapearance date.
If he doesn't then the pros went to a whole lot of trouble setting the stage for nothing.