Haven't paid attention to Seattle's alignment this year but when Mebane was there he played LDE as a 5 technique mostly. Basically just two gapping that side, he was a beast there and it worked well. But, they also used Irvin and Clemons/Avril I think as "LEO" type strongside backers to rush the passer.
They also had a ton of talent so being creative was easy. We don't have a pass rush and Wilber/whoever aren't near those guys caliber.
But, once Lawrence comes back, playing around with TC at end and Irving at DT or McClain/Thornton on run downs would be worth an experiment in my opinion at least. At the very least it might be stout against the run.
Not sure how many snaps Irving has had at DT but he was efficient in the snaps he got last year, we have to find a way to generate some kind of pass rush occasionally and get more production out of the DL. Maybe Collins will show enough to warrant attention at some point. I hope.