GethPrimeMKII wrote...
Allow me to ask this from a literal perspective:
What's the point in offering Shepard the keys to his own fleet of monster-starships? The catalyst obviously seems convinced that the cycles are the correct path. So why turn over controls to someone who will immediately end the cycles for good?
Because the Catalyst
isn't convinced that the cycles are the correct path,
not any more after the Crucible is docked.
Why? Hell if I know. There are so many things in ME3 that needs clarification (not just the endings), but we never get that clarification. Yeah, speculation for everyone I suppose.

If he's just handing over control so casually, it must have been something he could have done on his own, right? I mean, we aren't seriously going to buy the "the crucible changed me and created new possibilities" line, when the crucible is just a giant battery, are we?
Perhaps. This is my take on it though:
Notice that control switch on the left? It's actually part of the Citadel, not the Crucible. That means that whoever build the Citadel must have also build the control switch.
Could it be that the creators of the Catalyst also created the control switch that allows an organic to take over control of the Catalyst? Yes, yes I think it could.
Since the control switch is part of the Citadel, the Catalyst obviously knew about it for like... his entire life. He also knew that he himself is created by organics. He also knew he was created to protect organics, to find a solution.
The Catalyst wants to find a solution, but at the same time it also wants to protect organics. It's tragic really, because the only solution he could come up with to protect organics is to hurt them and turn them into Reapers against their will. It is a perverse solution, but it's the only solution the Catalyst could come up with to preserve organics.
Now, several billion years later, a pissed-off organic finally manages to build the Crucible and deliver it to the Citadel. This pissed-off organic is not happy with the solution.
Is it really that weird that since the Catalyst is created by organics for organics to protect organics, that he maybe realizes his solution is not so great after all once he sees Shepard desperately trying to stop him? Coult it be that after seeing Shepard, the Catalyst only now understands the full extend of the suffering these organics go through because of his "solution"? These organics, that he is supposed to protect? Could it be that the Catalyst therefor decides to put the fate of organics back in the hands of an organic?
This is just my idea of course. I don't think my idea is definetly true, but I think this could be true. I think it is a pretty water-tight explanation for the Catalyst's strange behavior.
So if stopping the cycles was an acceptable solution, because its obvious to the catalyst and everyone that this is what Shepard will do, why then couldnt the Catalyst do that himself? Why does it have to be Shepard that becomes the new Catalyst? What's so special about Shepard?
Because Shepard is the first organic to unite the galaxy and succesfully dock the Crucible to the Citadel. Why the Catalyst gives Shepard the power to decide the fate of the galaxy is something I just explained in this same comment.