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It is argued that the recent Belle data, consistent with no activity in thespectrum of the $B^* \bar B + B \bar B^*$ pairs at the mass of the $Z_b(10650)$resonance, imply that the part of the interaction between heavy mesons thatdepends on the total spin of the light quark and antiquark is stronglysuppressed. In particular this part appears to be significantly weaker than canbe inferred from pion exchange. If confirmed by future more detailed data, thesymmetry with respect to the light quark spins, in combination with the heavyquark spin symmetry, would imply existence of four additional $I^G=1^-$resonances at the thresholds for heavy meson-antimeson pairs.

Light Quark Spin Symmetry in $Z_b$ Resonances?