Weights for compact connected Lie groups

Let \(\ell \) $\ell$ be a prime. If \(\textbf{G}\) $\mathbf{G}$ is a compact connected Lie group, or a connected reductive algebraic group in characteristic different from \(\ell \) $\ell$ , and \(\ell \) $\ell$ is a good prime for \(\textbf{G}\) $\mathbf{G}$ , we show that the number of weights of the \(\ell \) $\ell$ -fusion system of \(\textbf{G}\) $\mathbf{G}$ is equal to the number of irreducible characters of its Weyl group. The proof relies on the classification of \(\ell \) $\ell$ -stubborn subgroups in compact Lie groups.