and here's why i think this:

in "The Son also Rises" Romo says:

"There's no greater ally, no force more powerful, no enemy more resolved than a son who chooses to step from his father's shadow."

so Lee at the end of Season 3 is stepping out of his father's shadow

and according to the hybrid

hybrid
“ Soon there will be four, glorious in awakening, struggling with the knowledge of their true selves, the pain of that revelation, bringing true clarity. And amidst confusion, you will find her... Enemies brought together by the apostle, enemies now joined as one. The way forward, once impenetrable, yet inevitable. And the fifth, though still in the shadow yet clawing for the light, hungry for redemption, that will only come in the howl of terrible suffering. I can see them all, the seven, now six self-described machines who believe themselves without sin. But in time, it is sin that will consume them. They will know enmity, bitterness, the wrenching, the agony of the one splintering into many. And then they will join in the promised land, gathered on the wings of an angel. Not an end, but a beginning."