Ok, back again. Just took a read at the new escalation comic, The little turd that ordered the hit on halsey, osmand I believe, Is trying to stir shit up, Again.
(SPOILERS) She seems to know more than enough about the smuggling of the deadly "Bioweapon", knows of key covenant remnant growing in trade routes, and even goes as far as setting up the stage for a new all-out war with the storm covenant with the help of some sanghelli, who also was carrying a container holding the (presumed) same bioweapon that has been unleashed on sedra.
Footage showed a lab where a few jackals were exposed to something that degraded and broke them down to liquidy mush, then later showed human prisoners, which would most likely be test subjects for the dna specific targeting. I bet the whole shinnanigan with locke and the sedra incident were a setup as well, with oni having sent in a " new aquisitions" team, gathering intel on biological attacks on humans.
I also wouldn't be suprised at all if the chief turns on oni or the unsc as a whole, They kidnap, murder and straight out won't settle with peace, even if palmer or lasky proved that the storm covenant acted alone or not at all in some accusations. Chief even told in person during a de-briefing that the didact was responsible for the new phoenix incident, where instead of telling the truth, the heads of the military wanted to play it off as a covenant attack. In some cases, spies/sabateurs, one even being a spartan, intervened in peace talks, which would have solidified truces and even trades. By the looks of it, osmand has a personal agenda against halsey and the remaining species, After all, halsey was already in custody, killing an unarmed prisoner would be murder.