with the whole djd killing 200 people thing and everyone shouting overpowered (especially when it comes to ultra magnus and etc)
the one thing is that. the lost light was probably totally unprepared to deal with that. i dont mean with firepower, but rather that i doubt the djd just leisurely pulled up
the djd came in armed and ready to deal with a fully powered phase-sixer, likely not expecting him to be disabled and detained. the lost light has some heavy firepower, but if caught off-guard things quickly lead to death all around.
overlord alone was able to not only incapacitate magnus, but nearly kill him. the djd consists of one mech with the same/similar power and endurance as overlord, plus two much larger behemoths. and vos and kaon are definitely dangerous too, albeit in a much different way.
with the lost light unprepared to deal with a full scale attack, it was easier for them to be overtaken, especially since it’s likely that they had already lost rodimus before the attack
not to mention the two things that swayed the fight against overlord in their favor (trepan’s trigger and fort max) weren’t factors in the battle with the djd
after they took out the biggest and hardest hitting targets it wouldnt be hard for them to wipe out the rest of the crew, especially considering a lot of them were scientists or civilians rather than front-liners on the battlefield