What's that you say? He's never shown any special ability in the 1500, and his 6.56 with a horrendous start indicates that he has the top-end speed to run sub-10.1 basic in the 100 this season? Well, that improved top-end speed will only help him that much more in the 1500 ---- no one else in the 1500 has that sort of speed, so once he gets the endurance part down, he'll be nigh-unbeatable!
The 1500 is simply his more natural event. I understand your point that he strains badly at the end of 200 and 400 meter runs and his success in the 200 seems primarily to be a function of his top-end speed, rather than any extraordinary speed maintenance abilities. And - yea - the primary impediment to his 100m performance is that he's losing about 0.10 or more in the first 20 meters. But instead of focusing on sharpening his technique and race patterning for that 20 meters, he should instead focus on developing cardiovascular endurance and lactate mitigation capacity.
Well, yes, I was part of the chorus of voices that suggested that Jeremy Wariner should have moved to 800m. And, yes, now that you mention it I am of the opinion that Abby Steiner will eventually need to transition to the 400m to compete at the international level. Yes, I have always believed Cristophe Lemaitre was more naturally suited for the 400m than the event in which he won an Olympic medal. And, finally, yes, I long contended that Michael Vick should have been moved to running back. I have no idea what any of that has to do with my opinion that Matt Boling is inherently a 1500m runner.