VB, I hear you big time.
Actually last year we ran what, 3:02 and didn't make the WC finals?
That means if we carry reserves to run the heat/semi-final, even that quartet has to be prepared to run 3:00 outdoors. Quow will produce a 43/44 leg once in shape, Gordon will be expected to split in the 44s as well with his speed and growing 400 credentials.
I do believe the once younger guys (Hewitt, Solomon, Alleyne-Forte) are also now seasoned and should know how to run relay legs (i.e. the importance of keeping in contact with the lead group if we are not in front, positioning at hand-off, etc).
Added to that we now have a very strong and talented (ahead of schedule) junior/senior group that we haven't had in a while (Lendore, Cedenio, Richards).
And lastly we have Jehue Gordon and Emmanuel Mayers, two 400m hurdlers who will always be capable of running strong 4x4 legs because of the conditioning that comes with their individual event preparation.
The key is to get them together early after the Oly trials to work out as a group, run meets in different combinations to determine the strongest quartet and second string for the heats/semis. That of course requires an NAAAs and appointed coach with a mindset for strategic and tactical preparation, because really we have a great chance to medal if we are serious about it.
With the talent above the Oly trials 400m might be as interesting as the 100m.