IF the runway has a 2.5nm MRS, then the min wake is 2.5nm, IF the runway has a 3nm MRS, then the min wake is 3nm.
If that's the case, I'm struggling to understand why your graphic has two completely different matrices for wake separation and MRS, with the RECAT value obviously being the higher of the two for the relevant leading/following pair.
Or are you simply using the term "wake" to mean the resulting in-trail spacing, rather than specifically that which is determined by vortex considerations ?