There was a runner from South Africa whom I read about in "The Lore of Running", who followed a 15 month cycle of training similar to the concept of combining Lydiard and Coe. He broke the world record for the half marathon, I believe in the early 80's. His first 9 months was all very Lydiard based, then he shifted to more speed oriented work, not a workload as heavy as Coe, but then again his focus was the half marathon not the 800. However his speed work was shorter and faster than I would have expected to see for a half marthoner. I'm sure someone will know who I'm talking about.
At the time I was reading about him my prior 9 months of training was very similar so I decided to experiment and folllow along with his program. My focus however was the 800/mile so I shifted a little closer to the Coe plan for the last 4 months and it produced my best season of racing on the track. Could this type of plan be condensed to a 12 month cycle? I can't see why not, at least as long as you have several years of consistent training.
I read about a workout Coe did once with a national caliber 10000m runner which gets to the point you rasied about the Lydiard trrained runners ability to handle a 400m workout better than a Coe trained runner. Coe and this other runner arrived at the track around the same time and Peter Coe asked the other coack if his runner would mind doing a workout with Seb. The coack asked what Coe was planning to run, Peter told him 8 x 800m so the other coach agreed as it woould seem to be a workout that would favor his runner. The first 2 were run at 2:06, then 2 at 2:04, 2 more at 2:02, when Seb dropped the last 2 to sub 2:00 the 10000m runner was unable to stay with Seb. I believe this speaks to the level of fitness arrived at over years of solid training and the ability to run so fast for 800 that to run at 2:04 pace was very comfortable for a runner like Coe. Could a young college runner expect to do something like that, definately not as he has not had the years of trianing to develop to that level of fitness. At least thats the way it looks to me.