Frankly, if all you can do is about a 4:10 mile, how are you going to be world class at the marathon? It is possible but hard. You need to be able to run 4:40s for 26.2 miles. Then 1 hr or under for a 1/2 marathon, which is 4:34. So, your threshold runs (1 hr pace) would be 4:34 or better. 10k pace workouts for Solinsky at its best would be at 4:20 pace. 5k pr pace for him is 4:10/mile. So, obviously, for him to get back to the kind of shape he was in in 2010, it will take him being able to run 1500m a lot faster than that 3:51 he ran. 3:46 is a big step. He'll need to get down into the mid 3:30s to be back all the way. And then he'll be able to run those necessary 10k and threshold pace runs. Good to see him making progress again.
Oh, you're saying Solinsky was capable of better than 3:46 in 2010? Thanks for that brilliant insight.