There's a couple things I've noticed that everyone else seems to have been glossing over are these little bits in the Tinker notes and power notes.
After this jump any powers are now part of you instead of your shard/passenger, and its connection is severed completely. All other shard limitations are released, even if you stay, letting Tinkers mass produce their tech, precogs see the Entities and Endbringers, etc. This doesn't enhance your power, only removes things like the Manton Limit that held it back before. The same applies to your companions and anyone you bring with you.
So, what's everyone else thinking about Aisha now? Or, heck, if we're being generous here, the Undersiders in general? It doesn't specify Followers or anything like that, just 'anyone you bring with you,' which is...
incredibly broad. Throwing confusion into the mix is that Joe... technically is still within the Worm jump, and cannot move on, or anything of the sort - yet this is specifically a post-jump effect. It brings into question whether or not it'd apply at all, what the criteria are, etc.
Is every Parahuman that ends up allied with Joe going to get spiffy new Manton Limitless Inherent Powers? I know that'd cause quite a bit of commotion amongst people in the know, if it were discovered, and even with divination disruption, that seems like it'd make waves in shardspace, which could certainly have repercussions given he's actively creating a grey goo base there.
It'd also mean fascinating interactions between Cauldron and Apeiron. God knows they'd probably be trying to break out their best Thinkers that still work if they wanted to approach him, and finding out what he does to Shards would be promising. The next Endbringer fight is liable to be fascinating, as well - and result in an interesting interaction between the In The Know Cauldron members and Apeiron, once all's said and done, assuming they can catch Joe at a private moment.
Tinker abilities give you an insanely large and advanced database of scientific knowledge and superhuman skill at employing it, all within their specialty. Your power will always mean that within this field you'll learn, innovate, and improve in superhuman ways, growing beyond what you start with.
As if Joe needed his skills to grow over time
even more than normal, there's this. Joe's skills in everything Efficiency and Miniaturization cover just got Heretical Adaptation'd. Not sure how many other boosts he's gotten that
ensure future growth of technical skills in distinctly superhuman ways even once the Forge has run out of surprises, other than stuff that'd just do something like boost intelligence. Spiral's inherent nature makes me wonder if it could do something similar - no limits, and all - but I don't know enough about the source material there to say for certain.
All in all, fun power get!