That´s not outsmarting, that´s handing an idiot ball the size of Jupiter to the Catalyst (again). As I said, they did not arrive in a stealth ship, they barged in via a mass relay, a high energy system which probably distorted local gravity, mass and whatever. That´s something noticeable, unless you design space stations where you don´t care that unexplained energy spikes happen within the station, where you house your central intelligence and design a network system that doesn´t realize that something is fishy in the connections for 50.000 years, hacked by people who were unaware that there actually is an AI on board.
the most incapable, cut off from the outside world, incorporeal, abstract, incapable of complex material actions, the best the catalyst works, and the less plot holes/inferior scenario it creates.
he is a useless addition (everything he've said/done, could have been said/done by any random reaper) so the less concrete impact he has, the better.
ah, just for curiosity, how do you conciliate:
a ) the fact the the catalyst declare that he is controlling the reapers (collective intelligence etc, the sheparlyst fully control them etc, the space brat starting to call himself as "we" etc), or at least has a very strong influence over them
b ) the fact that the catalyst want the crucible to be used (he's solution won't work anymore!), but if shepard wait too long, it appears a game over scenario with "the crucible has been destroyed" (I've always supposed by the reapers)
c ) tha fact that if the crucible could be simply not used and than removed/destroyed without consequences, how in the hell the variables have been changed? If the reapers win the battle and remove the crucible, how the variables have been changed?
Which of this horrible, unlikely assumpion to you repute the less absurd? 
1. the catalyst has a very weak control over the reapers fleet. He can merely influence them, and only the long term. They are trying to destroy the crucible (as they tried to do before), and they'll continue to do so despite the change of variables. So the catalyst need Shepard to act quickly, before his own pawns destroy the crucible and thus his masterplan (next cycle will win)
2. the catalyst has full/great control over the reapers fleet, and so the reapers fleet is not attacking the crucible; but the crucible, being in the middle of a huge space battle, is in a dangerous position: with "stray bullets" everywhere, it's inevitable that in few minutes it will be damaged and destroyed (next cycle will win)
3a. The destruction/removal of the crucible (indipentently by whom and why: overload, friendly fire, reapers etc) will very much likely release a wave of energy that will heavily damage the reapers fleet (and possibly, the catalyst), and they will be unable to win against next cycle.
So the catalyst, indipentenlty of his level of control over the reapers, needs to act quickly, in order to avoid heavy losses
3b. The destruction/removal of the crucible ((indipentently by whom and why: overload, friendly fire, reapers etc)) will cause no immediate, negative consequences for the reapers, but the mere fact that organics were able to go so far (build the crucible; make the crucible dock on the citadel; activate it; only one little little step from total victory) is enough to makes the catalyst realize that his solution is no longer effective