In canon, they were following a plan. The Endbringers had consistently shown some improvement or new power each time the heroes got close to doing major damage, so their full capabilities are never actually known.
Which is a fair point, but not the same thing as saying that their full capabilities continued to scale upwards.
Temporal energy is manifestly a thing in Worm, but the fact that Behemoth is a dynakinetic has not on-screen translated to anything like temporal manipulation. Quite the opposite, since it was Phir Se's time/energy manipulation that fucked him worst.
You need positive evidence to declare that Behemoth could increase personal speed by dynakinesis.
In New Dheli, Behemoth doesn't try to outrun Scion is because, at that point, Scion is no longer aiming just to drive the EBs off - it is known by the EBs that Scion will kill them now.
I strongly disagree.
If this were so, Behemoth would not have been trying to suicide nuke New Delhi when Scion caught up with him, nor would Ziz et al have turned on Scion at Gold Morning if they were hardcoded to allow him to kill them off.
Ziz certainly wouldn't have outright faked her death to deceive him.
If anything, the way the EBs chose sides validates Eden's apparent strategy of not letting the EBs be too strong or too versatile.
Hell, it's arguable that the EBs do not even understand their own origin; Scion is explicitly a blank to Ziz, after all, and she has the most insight.
In any event, their "deaths" are planned parts of a normal cycle, so they sandbag as much as they need to in order to fulfill the task assigned to them and to conserve their energy; since unleashing more of their potential power likely draws dramatically more power than they can sustain (they weren't properly set up by Eden, so that has all sorts of implications) they use exactly as much power as they need to keep up their charade.
Point of order:
Their deaths are
allowed for as part of the cycle, but that is not the same things as stating that they were supposed to be expended.
Note how in Eden's original vision, not a single EB had been lost.
Furthermore, the EBs performing better is more a matter of tactics than it is power; see Khonsu, or how both Ziz and Leviathan changed tactics after Behemoth died.
Leviathan only needs to spend more time underwater to make things harder on the defenders, or to attack a city and move on to another, like he did in canon; Earth Bet is not awash with strategic-range teleporters.Ziz only needs to show up with weapons beforehand, instead of constructing them on the battlefield. Or pick difficult targets, like planes, where only fliers are viable participants.
Or they could simply attack simultaneously, splitting available forces.
EDIT
Also note that while the EBs may have large reserves of power, there is no evidence that their throughput scales up in the same way.
Ziz for example needs tons of uninterrupted free time to put most of her Rube Goldeberg schemes into action; she can't just do it all immediately, despite being a precog and postcog.
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