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We prove a Kadec-Pelczy\'nski dichotomy-type theorem for bounded sequences inthe predual of a JBW*-algebra, showing that for each bounded sequence$(\phi_n)$ in the predual of a JBW$^*$-algebra $M$, there exist a subsequence$(\phi_{\tau(n)})$, and a sequence of mutually orthogonal projections $(p_n)$in $M$ such that: [$(a)$] the set ${\phi_{\tau(n)} - \phi_{\tau(n)} P_{2}(p_n): n\in \mathbb{N}}$ is relatively weakly compact,$\phi_{\tau(n)}=\xi_n+\psi_n$, with $\xi_n := \phi_{\tau(n)} - \phi_{\tau(n)}P_{2} (p_n)$, and $\psi_n := \phi_{\tau(n)} P_{2} (p_n),$ {\rm(}$\xi_n Q(p_n)=0$ and $\psi_n Q(p_n)^2 = \psi_n${\rm)}, for every $n$.

A Kadec-Pelczy\'nski dichotomy-type theorem for preduals of JBW*-algebras