Let's talk about our High Tech Annihilator.
Jack as overall is most inaccurate and strangest example of power in this universe, probably because there were several Jacks. About Jack's strength should already be stated by the fact that his first model was sent to kill Kazuya then he was upgraded and renamed as Jack-2.
Jack-2 was so powerful that it had to be shot down by satellite beam and we're talking about second weakest model of this android. with all progress Jack-4 was created a superior version of Jack-2 and Gun Jack of which copies or something like that were also created and other future models such as Jack-5 who started to collecting data from the tournament. G corporation also makes two new models Jack-6 and Jack-7 where the inferior one was able to even take down a large meteor by himself.
Jack although it may be strange considering he is a robot/android also has Ki or Chi as he can do Ki Charge. Some Jack models can even perform self destruction which are powerful enough to actually injure even Mishima family member not to mention will all his skills such as extrasensory perception, power nullification or what Jack-8 has which is energy projection.
What i'm getting at is that the power of each Jack model is very inconsistent and i wouldn't have a problem with that if we didn't get cameo from the many Jack-7 robots in Tekken 8 as punching bags at War at Yakushima for everyone... i can understand Heihachi being capable of defeating some of them at once but practically the strongest version of such a android that has impessive feats is now equal to regular G corp member and it's nothing against characters like Shaheen, King II or even Lili? Jack's whole engineering doesn't make sense to me because of this because we had Jack robots with an unknown number that should be used to be jobbers and not Jack-7 himself unless Jane Jack's are something more and rest are poor copies.
In my opinion main model of Jack should remain as the only one or his clones should at least become jobbers because as a supernatural and superconstructed android he seems to be really weak or rest characters become unnaturally much stronger from part to part and will same thing happen to Jack-8 and will he become the weakest character? I wouldn't want that and in fact three characters were needed to take him down then he still may become jobber and i don't think that Lili and Asuka are strong enough to harm him at all but i like to think that Alisa (another android that should be very strong) wore him out enough that those two just finished the job also by surprise attack.
So Jack-7 in my tierlist would be a Low Tier character maybe even lower and Jack-8 i guess should be High Tier for now i guess since he defeated Alisa who held her own against Nina although if it was up to me i would definitely put Jack above for the reasons I listed above, he has a much more versatile range of skills and is the pinnacle of pure strength and his first model was send to kill Kazuya so he should be pretty strong maybe between Top and Mishima tier.
Mokujin - Jack-8 current strength
Silver Mokujin - Jack-8 strength i would give him
Combot - Any other Jack model current strength
(Part 5 will of course be about Alisa)