Completely agree. Loulou5050 is not nearly as tough as efefgg, but perhaps the new brute gives a better idea of how a brute competes because he won't win 98 out of 100 fights. But let's take a look at the interesting question of WHY efefgg is a better brute.
Efefgg is very front-loaded, which makes him great for testing low level brutes. By level 30, he's got triple-T and all three multipliers, plus fierce, survival, and shield. No weak spots on this brute. Loulou has only strength and one multiplier, plus thief which is weird and unusual. With tornado and skin plus whip and sai, he's a tough customer, but his stats are all in strength.
By level 100, efefgg still has much better stats, but loulou has improved a lot. But efefgg has implacable and untouchable, impact and sabotage, 6th and pugnacious, plus hammer, cry, and net. Loulou doesn't have any anti-pet skills at all, and only implacable. 20 skills vs. only 14. In fact, efefgg has as many skills at level 93 as loulou will have ever. As far as weak spots go, at level 100 efefgg lacks armor and tornado (both of which he gets by 290) while loulou relies on static defenses and hit points. His only real strength seems to be against agility/sabotage brutes -- which is why he beats efefgg once out of 10 fights on the simulator and fights him down to survival twice. But he loses 9 of those fights. By level 300, loulou has caught up a lot -- some might say his stats are better -- but he still loses most fights to efefgg.
So, why the change? Perhaps people complained that efefgg was too tough to be the default brute, or perhaps, I dunno, efefgg's owner complained. But if I'm looking for a really good brute and want to give it a really good test, I'm not even going to let the fight with loulou5050 finish before switching it to efefgg.