Once something has a bit of meat and a leader, it can become an entry in the Investigation column. Issues there should indicate, at a minimum: brief abstract, what it would do if successful, who would be interested/supportive (types of people&orgs, not individuals), and next steps. By moving something here, a Specialist indicates intent to lead the investigation and report back to the team. (He/she is assigned to the relevant entry as an “owner” in the strategy funnel.)
Further steps in this process could include 1:1 meetings, discussion at industry conferences, blogging/public discussion, workshops.
Onward directions include: recommend to incubate (with or without team involvement), to evaluate for chartering because there is already sufficient incubation, recommend to liaise elsewhere, write up and put on hold, or actively recommend against work.