Given all the known corruption that's gone on within the Mueller "investigation" and the venomous anti-Trump bias held by more than one person conducting/involved in it; if someone who's a target OF that investigation (either current OR future) can be indicted for perjury simply because he uses the wrong tense of this-or-that word vis-à-vis what he had previously stated - or what someone ELSE had previously stated...or he can be indicted because he recalls the wrong DATE this-or-that had happened or that he had became aware of it...or, as in the case of former national security adviser Flynn, 'can be charged with lying even thought the FBI agents who'd interviewed him said THEY DIDN'T THINK HE HAD...then, yeah, yeeeeew ever lovin' dadgum betcha I'd take the flippin' 5th, too.
One would have to be a MORON not to do so.