Extreme solitons in optical supercontinuum are usually attributed to inelastic binary collisions of solitons, which favor formation of a single huge champion-soliton. The latter accumulates a great part of the system energy. We argue that there is an alternative possibility: a soliton can be quickly reshaped up to a single-cycle limit, whereas soliton energy does not change much. The reshaping takes place for a strongly asymmetric group-velocity-dispersion profile, the solitons are enhanced due to interactions with the low-amplitude dispersive wave packets.