Simpson/Blackmer are lovely skaters but there's so little size difference between them, I don't think they really have a future in Seniors (not like he's going to grow at this age). Sorry.
There was perhaps even a smaller difference between Tai & Randy; I thought S&B were done last year, and was shocked to see how well they skated at US Nationals this year. However, at this point, they don't have a triple twist. What they do have:
FiDs4 -with the new death spiral rules, quite a few teams are not able to get level 4 on any death spirals.
Throw triple loop & Throw triple salchow (they landed all their throws at US Nationals, and the throws had decent size)
They did not seem to be having trouble with their lifts.
2A 2A sequence
They need a sbs triple jump. This is not affected by their relative sizes.
They need a triple twist. This is affected by size.
The problem they'll have is that the skills level of US pairs has improved. Of the top 4 or 5 teams, all have triple twists now, and one if not 2 sbs triples. US pairs aren't top 6 at Worlds material yet, but the field is really quite strong right now.
Calang & Sidhu are another team with no side by side triple, but they do have double axels. They do have a triple twist, although not of the most beautiful quality. Their throws are sometimes iffy, but they have a triple lutz throw and a throw triple salchow, and FiDs3
Aaron & Settlage self destructed about as thoroughly as I have seen any team do, and blew a respectable 3 point lead in the SP down to fourth in the free, and third overall. Calang & Sidhu deserve their spot at Junior Worlds. It isn't like there is anything so far about A&S that makes them stand out that much from the pack of juniors. After all, even in the SP, which they skated cleanly, they were just less than 3 points ahead of B&S and about 5 ahead of C&S (who had some problems with their 2A there).
A&S may really rock it next year. They have an iffy 3S, which is a plus, but both throws in the long went splat, as well as their double axel sequence, and the triple twist wasn't particularly great either. I don't see such talent there that they should be given a free pass to Jr Worlds. Let Calang & Sidhu have their day in the sun. It isn't like the US is going to qualify 3 pairs to Jr Worlds next year whomever they send, or that they will lose a spot either.
Who knows what any of these teams will do in seniors? Every one of them will need to upgrade their skills to make the jump. In the case of A&S, they need the mental toughness skill, not to mention better landings on their throws, and their 3S needs improvement, too.
Calang & Sidhu need a SBS triple and better twist technique.
Simpson & Blackmer need a triple twist and a side by side triple.
It isn't like Junior Worlds is the Olympics, and you have to wait 4 years for the next one.