Constantine used the Edict to then invade the Eastern Empire on the grounds of 'allowing people to be free to believe what they want'. With the Edict he not only got a very large underground movement against Imperial Might to stop being against Imperial Might, but become pro-Imperial Might as long as it was *his* Imperial Might.
And, of course, he could then also control Christianity with it being tolerated. He could order bishops to come to a council to sort out what was a dispute in one city. He could then exile bishops for upholding the council's decision against his wishes. Both of which he did. It was all about power and control, as was Theodosius' decree that allowed him to suppress the army and elites that were threatening his grip on power.
A: No, no I cannot. I got some of them, though.