Thank you for the question and its a good discussion to have.
My view is that it would be unfair to compare the Retro Funding inclusion of 2 separate Governance Structures/Entities when one has a clearly defined operating budget while the other doesnt have a budget. So if we consider the Grants Council which has a forecast budget of 390k OP, and the Lead has a proposed compensation of 35,000 OP for the season, and other members have various proposed compensations outlined as well. Whereas for the ACC, under the Retro Governance Participation Rewards framework the ACC Lead and every member of ACC gets 3000 OP, which is not much compared to the Retro Governance Participation they would receive as regular Delegates without being a member of ACC (assuming both ACC Member Delegate and non-ACC Member Delegate fulfil the respective rewards criteria), for a full season of additional responsibilities as members of ACC, which is over and beyond their regular Delegate responsibilities. Given this, there is much less incentive for Delegates to work in the ACC and especially as the Lead (since in my experience the ACC Lead puts in a lot of the work in the ACC), and even for other Delegates who have to be active and respond to a potential emergency situation throughout the season, in case there is a capture.
Whereas in Retro Funding, though any reward is much delayed (often 1+ year), the Lead can expect a higher reward for their work. Atleast this was the criteria in RPGF 6 which was the first occasion where the S5 and S6 ACC leads were compensated for additional rewards beyond the Retro Governance Participation Rewards.
So my thinking is that for Governance Entities with separate budget, they have decided to forego inclusion in Retro Rewards but for entities without any formal proposed budget such as the ACC, they may still be rewarded by Retro Rewards in a future date if the Collective feels their work has brought an advantage to Governance and to the Collective as a whole.
Infact the reason we have outlined inclusion in the Retro Governance Participation Rewards in the Charter (which was not there in the earlier ACC Charters ) is because some ACC Members felt their reward was not commensurate with the time and effort put in, and it would help to outline atleast Retro Governance Participation Reward inclusion in the Charter, so as to incentivize Top 100 Delegates to be a part of the ACC.