  Proximity coupled spin-orbit quantum wires have recently been shown to
support midgap Majorana states at critical points. We show that in the presence
of disorder these systems are prone to the buildup of a second bandcenter
anomaly, which is of different physical origin but shares key characteristics
with the Majorana state: it is narrow in width, insensitive to magnetic fields,
carries unit spectral weight, and is rigidly tied to the band center. Depending
on the parity of the number of subgap quasiparticle states, a Majorana mode
does or does not coexist with the impurity generated peak. The strong
'entanglement' between the two phenomena may hinder an unambiguous detection of
the Majorana by spectroscopic techniques.
