Finishing up air sealing my attic today and about to get started on installing baffles for blowing in insulation.   
1. At the edges where there are no eaves/soffits, there's this gap between the back of the wall and the brick exterior (interior drywall | stud bays | exterior drywall(?) | pictured gap | brick exterior). Do I need to keep blown in insulation from filling these gaps (i.e. is this gap present to better allow the brick exterior wall to "breath"?) Old insulation was blocking some bays, but not all. Insulation around windows is also visibly blocking bays. So I'm not sure if I should be prepping to ensure air circulation here or taking into account this extra bit of area that needs covered by insulation

2. I believe the garage creating an L shaped house was a later addition. Along the hip there's this sheathing on the trusses with a small cut out pictured. but it doesn't extend the full length of the hip. I noticed that when working in the corner pictured it was a lot stuffier than anywhere else in the attic. My first thought is this "interior sheathing" is blocking air flow, but I'm not really sure if that sheathing is structural or if I should be cutting holes into it to let air flow between both sides of the attic. But as is currently this corner essentially has no intake for ventilation which leaves me concerned. (However, I didn't notice excessive damage from mold or anything on that side. Most of that was around where attic fans had been venting into the attic) 

Double checking ventilation/baffle needs before blowing in new insulation - 1960s Brick Ranch on Slab.