Buff sigmas main tank capabilities. Only reason people play orisa sigma is becuase signas abilities are all valuable and powerful but he is a worthless maintank, easily the worst one of them all, so they pick the best sheild tank that synergises best with him which would be orisa making playing him viable. Nothing about his kit gives him anchor status, all of his Abilities are suited to the off tank role and yet he has a sheild. They either rework him into a proper maintank OR they give him old symms sheild(the one that moves forward constantly and broke when it hit a wall and had a cd) to make him a better off tank.
We are just looking at the goats incident again. Brig was added, was insanely strong character that couldnt work in any of the already present comps or any 2 2 2 comp so goats was made to her liking and she was able to unleash her potential. In goats she was played as a dps that just healed as her secondary function not an actual support, and you can confirm this becuase most dps owl players were the ones playing her. Same thing with sigma,
an offtank that has a maintank sheild. Again in owl the off tank players are the ones playing him.
I actually really like this idea. It would stop people considering him a main tank just because he has a shield.