  The search for di-Higgs final states is typically limited at the LHC to the
dominant gluon fusion channels, with weak boson fusion only assuming a
spectator role. In this work, we demonstrate that when it comes to searches for
resonant structures that arise from iso-singlet mixing in the Higgs sector, the
weak boson fusion sideline can indeed contribute to winning the discovery game.
Extending existing experimental resonance searches by including both
contributions is therefore crucial.
