  Starting with the dynamical picture of the exotic $c\bar c$-containing states
$XY \! Z$ as the confinement-induced hadronization of a rapidly separating pair
of a compact diquark and antidiquark, we describe the pentaquark candidates
$P_c^+(4380)$ and $P_c^+(4450)$ in terms of a confined but rapidly separating
color-antitriplet diquark $cu$ and color-triplet "triquark" $\bar c (ud)$. This
separation explains the relatively small $P_c^+$ widths, despite these 5-quark
systems lying far above both the $J/\psi \, p$ and $\Lambda_c \bar D^{(*)0}$
thresholds. The $P_c^+$ states are predicted to form isospin doublets with
neutral partners $P_c^0$.
