OK, well I'm afraid I disagree about Felder's voice. He is adequate at best, particularly here. He doesn't bring anything to it vocally although I know he's trying. Therefore he can't lift it out of what it already was, a mediocre song.
The Eagles had two of the best singers in the business & one of them was being sadly underused on their later albums (by his own choice). I suppose I think the idea that more room should have been made for Felder's vocals when there was hardly any room for Frey's (or Meisner's or Schmit's) somewhat hard to take. In any case as we know he was given another chance to do a lead which didn't work. He was hired for his guitar playing, not his vocals. He admits himself he was the band's 'worst singer'.