THEORY OF RELATIVITY and E=mc square,

Do you agree with the Einstein’s Mass-Energy conversion theory?
What do you think; it is ok or needs to be restated?
Which one of the following do you prefer?

i) Matter and its one property the energy are interconvert-able to each other by the relation 
E=mc²

ii) Or mass and energy the two property of matter are related to each other by this relation.
Agree with the first statement if you think anything can be converted into its own property…

For example, if your skin color is white than you are same with white color…so you don’t mind if 
People call you saying...hay! Mr. White.

Otherwise do agree with the 2nd statement if you think things and its properties are totally different things. And properties of things can be used to represent the things but are not same.
This means Mr. White is only the representation of someone’s skin color (i.e one property of man –skin color) ..But white color is not the man…it refers to the composition of all visible frequency range Ems(electromagnetic radiation)…..so are the man is composed of these 7+ visible colors or the flex, bones, ….accurately saying ..composed of cells….precisely the matter

LASTLY…
According to Einstein particle(matter) cannot acquire velocity more than c(the velocity of light).
i.e, it is the maximum limiting velocity of matter 
if matter acquire such much of velocity…it changes into energy by the relation.. E=mc² 
‼!But..according to Newton’s Energy of particle moving with velocity c is given by,
E=mc²/2

if so…where is the rest of Energy…?

Or…can we speed up the particle to upper limit than c….