The gauge-orbit functor forgets only stuff

Setting: $X$ is a finite directed graph with vertex set $V=\{0,\dots,n_V-1\}$, edge set $E$ and maps $\mathrm{src},\mathrm{tgt}:E\to V$; a walk may use edges in either direction, and $X$ is connected from $x$ if every vertex is reached by a walk from $x$. $G$ is any group. A connection is $A:E\to G$; its holonomy $\mathrm{hol}_A(w)$ along a walk $w$ is the ordered product of $A(e)$ on forward steps and $A(e)^{-1}$ on backward steps. A gauge transformation $g:V\to G$ acts by $(g\cdot A)(e)=g(\mathrm{src}\,e)\,A(e)\,g(\mathrm{tgt}\,e)^{-1}$. $\mathsf{Pot}_G(X)$ is the category whose objects are connections and whose arrows $A\to B$ are gauge transformations $g$ with $g\cdot A=B$. $\mathsf{Hol}_x$ is the category of holonomy maps at $x$ (assignments $H$ of group elements to walks, multiplicative on loops at $x$ and unchanged by inserting a backtrack into a loop at $x$), with arrows $h:H\to H'$ the elements $h\in G$ such that $H'(\gamma)=h\,H(\gamma)\,h^{-1}$ for every loop $\gamma$ at $x$. The holonomy functor $\mathrm{hol}_x:\mathsf{Pot}_G(X)\to\mathsf{Hol}_x$ sends $A\mapsto\mathrm{hol}_A$ and $g\mapsto g(x)$.

Let $\mathrm{orb}:\mathsf{Pot}_G(X)\to\mathcal{O}$ send each connection to its gauge orbit, where $\mathcal{O}$ is the discrete category (identity arrows only) on the set of gauge orbits.

Statement. For every finite graph $X$ (connected or not) and every group $G$, $\mathrm{orb}$ is full and essentially surjective, and it is faithful if and only if $X$ has no vertices or $G$ is trivial.