Wait a minute.... calculate this macaw

i(ħ∂/∂t)ψ +i(α\hat{p})cψ- βsMscēψ = 0

that gives units of energy. i(α\hat{p})c- βsMscē should have units of energy but this is zero, and so here you are adding an extra energy term i(ħ∂/∂t)ψ. This is not zero.