  Poincare' covariant Faddeev equations for the nucleon and Delta are solved to
illustrate that an internally consistent description in terms of confined-quark
and nonpointlike confined-diquark-correlations can be obtained. pi N-loop
induced self-energy corrections to the nucleon's mass are analysed and shown to
be independent of whether a pseudoscalar or pseudovector coupling is used.
Phenomenological constraints suggest that this self-energy correction reduces
the nucleon's mass by up to several hundred MeV. That effect does not
qualitatively alter the picture, suggested by the Faddeev equation, that
baryons are quark-diquark composites. However, neglecting the pi-loops leads to
a quantitative overestimate of the nucleon's axial-vector diquark component.
