How shall we resolve the contradiction? Perhaps: Kenneth has two human legs and four table legs. But that suggests that Kenneth has six legs, and that doesn't seem right to say. Maybe we can say that his human legs are also table legs, so he has only four legs: two of them doing double-duty for table legs and human legs, and two of them doing double-duty for table legs and human arms. Maybe. But even the statement "Kenneth has four legs" seems wrong or at least misleading without qualification.
Much better to qualify with a qua: Kenneth qua human has only two legs. Kenneth qua table has four legs.
This should remind us of one of the standard solutions to apparently contradictory talk of Christ incarnate. Christ is eternal. Christ is conceived in time. Christ has boundless knowledge. Christ's knowledge is bounded. And so on. The solution is to say things like: Christ qua God is eternal and has boundless knowledge. Christ qua human is conceived in time and has bounded knowledge--and has two legs.
The naturalness of qua talk in the case of Kenneth should make us less suspicious of the incarnational case.