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I don't assign a super-marginal score to specific defenders individually.  Units get the supermarginal bonus and they split it between all of the players involved in the same way the unit's marginal value gets split...basically the super-marginal credit gets turned into wins at the unit level and the individual fielders are just splitting a larger piece of pie.
The team defense does help Felix, but DNRA > FIP in accuracy and value IMHO and Felix (using the pitching analysis in PCA, which is essentially a slightly simpler version of DNRA where certain assumptions about the rate of XBH, GDP and rare events that aren't in the pitching record other than PBP data) are applied) did a lot on his own to prevent run scoring that isn't captured in straight DIPS.  I do not know if it would be enough for him to be well supermarginal...there are usually about 1015% of all pitchers in any given year who are (and Felix would suely be among that group), but most of them are only getting slight boosts.  The slope is steep (which I consider a good thing).