If an apps owner does leave the company, only MS can set a new owner. An evironment admin must be able to set a new apps owner. Also same as already in Flows there must be an option
to set multiple admins and should be the same wiht o365 groups as for the most applications. Multiple admins must be visible for environment admins using GUI and Ps/Graphapi. From governance view there must be an option to set a secondary admin is mandatory on tenant level.