12.9 is the pace for a 52 second 400, so clearly he can run faster if he really wanted to. It's probably a combination of the off season and Salazar saying not to push hard for fear of needless injury
Wrong.12.9 is more like 49 flat pace. The first part of the 100 is slow due to the start. If he maintained his pace he'd be around 49.
In no way does a slow start cost 3 seconds.
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