With nothing to defend in Miami, I doubt he will play it if he doesn't feel better about the 'situation' with the FH/BH. So, I expect him to either skip
if he doesn't feel prepared, because he doesn't do well there anyway, and take a longer period of rest and restoration (as well as preparation)
for Monte Carlo.
I haven't any worries about catching Fed's record. His career is more 'complete' than Fed's, IMO, Davis Cups, Gold Medal, youngest career slam...
The rest... fuuggghhhedaboutit! He isn't chasing history, in my opinion. He's RACING time.