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JAE, I agree. The logic you used earlier is exactly how I felt about Cr... Its how we learned and that shapes our thinking and intuition. If we had learned from someone who did use it for 3ply headers, we'd probably slap that 15% in there at the blink of an eye. Bottom line is that NDS says...

I'm kinda treating it like a boxed beam sort of problem, where the extrme laminations resist all the moment and the interior(web) portions resisting the shear. Just due to the fact that I have no idea what those interior lumber grades are. I'd think this would be conservative??? Get your...

I think I'd contact an engineer that specializes in glulam design. The complication(for me) is that each layer in the glulam may be a different species of lumber. For example, you may have SYP DSS for the tops and bottom laminations and progressively get to SYP no 3 at the center lamination...

Which was my point. I had the same idea as JAE on the Cr but the commentary clearly shows that a 3ply header qualifies. I personally believe apsix has the correct logic on why. JJMT I believe your questions are answered in the commentary that I referenced and JAE posted. The answer is both.

I think it would be a good idea for some of us to read the commentary for Cr. NDS 05 C4.3.9. "It (referring to the 15% increase) is based on the increase in load-carrying capacity and stiffness obtained when multiple framing members are fastened together...." "It reflects two interactions...

I'd have to agree, a scab rafter extending the entire length is your best solution. I don't think you have enough room to develop the bending into the gusset them back out of the gusset into the rafter at the wall bearing side. Truss repair doesn't directly address bending in the plywood gusset...