  We examine the Fundamental Plane (FP) and mass-to-light ratio ($M/L$) scaling
relations using the largest sample of massive quiescent galaxies at $1.5<z<2.5$
to date. The FP ($r_{e}, \sigma_{e}, I_{e}$) is established using $19$ $UVJ$
quiescent galaxies from COSMOS with $Hubble$ $Space$ $Telescope$ $(HST)$
$H_{F160W}$ rest-frame optical sizes and X-shooter absorption line measured
stellar velocity dispersions. For a very massive,
${\rm{log}}(M_{\ast}/M_{\odot})>11.26$, subset of 8 quiescent galaxies at
$z>2$, from Stockmann et al. (2020), we show that they cannot passively evolve
to the local Coma cluster relation alone and must undergo significant
structural evolution to mimic the sizes of local massive galaxies. The
evolution of the FP and $M/L$ scaling relations, from $z=2$ to present-day, for
this subset are consistent with passive aging of the stellar population and
minor merger structural evolution into the most massive galaxies in the Coma
cluster and other massive elliptical galaxies from the MASSIVE Survey. Modeling
the luminosity evolution from minor merger added stellar populations favors a
history of merging with "dry" quiescent galaxies.
