No, no truisms violated. Bolt has a far better chance than Wariner for that 400m record. Taylor and Merrit have about as good a chance as Wariner. (Think Wingate, where the correlation between peak power and total power over 30" duration is quite strong.)
No one can maintain a velocity they cannot reach. Speed is inescapable. Bolt could have about the worst stamina in the world and still run <45 on a relay. And to put this into perspective, there are runners on international 4x400m teams who manage 45' splits in an Olympic 4x400m final, and most couldnt match Bolt over 100m even if given a running start to full speed!
Now if Wariner attacks on the speed side and sacrifices stamina (as he did last season), he risks losing ground. Wariner recognizes his limitation is on the speed side and that he's gone as far as possible with the stamina; Bolt's limitation is on the stamina side, but he has room for improvement. He attacked for stamina gains last season and smashed records because he can now maintain velocity.
The balance of speed and stamina determines the winner.
Very difficult to compensate for the (relative) lack of speed when the race duration is 43"-45". Remember Michael Johnson was just plain faster than Wariner. Wariner can get the 600m record, like Evans, but that's about it. The party is over when the real sprinters, with 9.6-9.8 speed start to get into shape. Some of them will break down from the endurance work (which for a good sprinter is 6x 26/200 not 6 x mile at 6/mile), but some *will* progress in the 200m/400m and make < 20 and thus < 44 routine.
And to be honest, Hart has chewed up a lot of sprint talent with the stamina work, and you can only push that so far also. It works for some, and for others not. From here on, if Wariner wins world titles, it will be because he can maintain through rounds, not because he is necessarily faster in the traditional final only sense.