Relativity theory from other angles

Hey, what if you derive
light speed from the
mass-energy equivalency
instead of the other way around?
Then, with that and a vanishing yet
non-zero gradient the cosmological
constant, then relativity the theory
with the L-principle can be framed
as sort of deriving in reverse the
light speed from the mass/energy
equivalency according to the "spacial"
and "spatial", Einstein's terms for the
space for SR and space for GR, thusly
that GR is first then SR is derived from
it and also the L-principle or light's
constancy of speed, is also derived
as an invariant according to the space
terms, why that instead of "K.E." or
e = mc^2 is the c = root(e/m). Then
also that makes for fitting electron physics
right next to that with e/m the electron's
charge to mass ratio.
About absolutes and what's relative and
Einstein's usual "this Einstein's relativity
is a very simplest negative statement that
velocity is relative" has, ..., there are others.
There's only one absolute, though, ....