  The effects of the $\Sigma_c\bar{D}^*$-$\Lambda_{c}(2595)\bar{D}$
coupled-channel dynamics and various one-boson-exchange (OBE) forces for the
LHCb pentaquark states, $P_c(4440)$ and $P_c(4457)$, are reinvestigated. Both
the pion and $\rho$-meson exchanges are considered for the
$\Sigma_c\bar{D}^*$-$\Lambda_{c}(2595)\bar{D}$ coupled-channel dynamics. It is
found that the role of the $\Lambda_{c}(2595)\bar{D}$ channel in the
descriptions of the $P_c(4440)$ and $P_c(4457)$ states is not significant with
the OBE parameters constrained by other experimental sources. The naive OBE
models with the short-distance $\delta(\vec{r})$ term of the one-pion exchange
(OPE) keep failing to reproduce the $P_c(4440)$ and $P_c(4457)$ states
simultaneously. The OPE potential with the full $\delta(\vec{r})$ term results
in a too large mass splitting for the $J^P=1/2^-$ and $3/2^-$
$\Sigma_c\bar{D}^*$ bound states with total isospin $I=1/2$. The OBE model with
only the OPE $\delta(\vec{r})$ term dropped may fit the splitting much better
but somewhat underestimates the splitting. Since the $\delta(\vec r)$ potential
is from short-distance physics, which also contains contributions from the
exchange of mesons heavier than those considered explicitly, we vary the
strength of the $\delta(\vec r)$ potential and find that the masses of the
$P_c(4312)$, $P_c(4440)$, and $P_c(4457)$ can be reproduced simultaneously with
the $\delta(\vec r)$ term in the OBE model reduced by about 80\%. While two
different spin assignments are possible to produce their masses, in the
preferred description, the spin parities of the $P_c(4440)$ and $P_c(4457)$ are
$3/2^-$ and $1/2^-$, respectively.
