Not that your schedule wouldn't work, but I suspect you are leaving something on the table. This system is actually more aggressive than the doubles, in terms of paces you might choose to run. A lot of the sub threshold runs in the doubles system are probably around M pace and 1.5 mmol even maybe. sirpoc I think used the phrase to push the envelope, to get close to the edge on each workout but never going over. I think that is the key to this and why everyone seems to be in their best shape. You can get significant volume in and as long as you have the discipline to stick to it and understand how to control your running, it's probably the most workout stress I've seen that you can get weekly, be recovered for the next one AND by staying clear of the super fast stuff, to stay injury free.
I just did a Marathon myself and have copied what sirpoc said on the Strava group he probably would do for the second half my training build up, if he were to run one and it's working great. I PB by 12 minutes for 2:51. My main change was to stretch the long run out a bit longer , but significantly slowed it down even easier than the easy runs, just to get time and duration on feet. I did zero running at MP for my entire 27 weeks I trained like this. On week 22 I entered a random 5k with some running buddies and also PB at 5k with no real thought of even going for it which was a nice surprise.