gamertag : firedune22
avid forger, love vehicle gameplay
Looking closely in the gravemind scene in Halo 2, you can tell that the gravemind's boy has been latched onto the bottom of the pit. Judging from how far the pit is, it can be concluded that we have no way of knowing how deep the gravemind's body really is. That gravemind to me, appears to be sessile, and capable of only limited movement. From the mona lisa we know that flood combat forms bring victims to the proto-gravemind. For that gravemind to have been crreated from a prote-gravemind, an increible amount of bodies must have been dropped down that pit. The proto gravemind in Wars might have been sobid due to the fact that lower life forms ware the only life forms available for assimilation. This might explain why Grunts and jackals could become infected, as the flood was taking anything available. Now, as odd as the Mobile gravemind was in Legends, it may exist in the timeframe of late Halo 2 to the last level of Halo 3. It didn't exist dunring Halo 2 per say, but it's origins start there. When In Amber Clad crashed into High Charity. a pretty sizeable controller was present on the ship, and was vastly intelligent proto-gravemind, as it pilotes in amber clad with more skill than any AI (even cortana) could have done, hence the slipspace jump into high charity. When High charity was finally taken over, a new gravemind had formed, this one strikingly like Delta Gravemind, crashed into the Ark and released it's pods.
When Chief activates, or rather deactivates the rings, massive tentacles appear, and then retract mysteriously. Perhaps this is because the mobile form had been released and was underneath Arby and the Chief. Perhaps it had not wished to be harmed in such a critical stage in it's development. Once High Charity was destroyed, wouldn't the pods have stopped landing on Intallation 04b? Perhaps this is because The new mobile gravemind had set up a base on the ark that fired the pods, like flood launchers in Wars, only much larger in scale. Perhaps There was a moblile gravemind on the Ark, controlling the invasion of installation 04b and the Ark, aiming to bring about a major flood presence on the Ark and 04b, which is presumed to be the gravemind's plan all along. To control the one thing that could wipe out the flood presence one and for all.
P.S
One interesting note is at the end of origins 2, The chief is teleported to what appears to be a burned-out or destroyed ring, with the ark in the backround, which looks very damaged (yet still keeps it's shape) and has a suspicious-looking charred inner section that fits the size of a halo's blast.