I never said every ele in the game will have top condition damage. I never said every engy in the game will have top condition damage. What I am doing is comparing the condition damage stat of 2 level 80 classes. I make the assumption that both classes I am comparing (in this case, engy and ele) are in max exotic armor with exotic weapons and jewels, superior runes, and no sigil or consumable boost to the condition damage stat. This assumption is made to keep everything on equal footing, seeing as obviously someone in rare armor isn't going to have an equal stat with someone in exotics or someone in masterwork. This would be an unfair comparison and therefore invalid for the matters of this example.
The comparison is over whether while an engineer is in a kit, which class will have more condition damage all other variables held equal between the 2 classes? Knowing that the engineer weapon's stats do not apply on kits, it is quite obvious here that the ele will have a higher stat while the engineer is in the kit because the elementalist is using a weapon with +cond damage on it for sake of the example. It doesn't even have to be a max condition damage weapon, something with +1 condition damage would put the other class ahead of the engineer in this scenario.
This information works both ways as well. if you have a bleed necro but no one who can apply burn in your group then put on incendiary power by all means, because the necro will be getting close to as many bleeds as you will as an engineer and do more damage with them and has no ways to apply burn. But do to the way burn scales and the fact that a common class has a high condition damage spec and can readily apply burns in this spec, in a general PvE content or a pug dungeon run where you don't know anyone's spec, bleed will be superior to burn. It is more readily applicable and will do more damage after a small number of stacks.