I am running on pure fumes and I fucking took a lovely nap in my boss's daughter's car so that was fun.
anyway onto the chores
You are assuming current power negation tech can affect a level 5 and even if it could it wouldn't be near enough against the current set of level 5s we know of.
Lets pretend just for a moment it does work on them fully...guess what yeah they can't use their powers but they still went through each stage (rebirth, balancing, strengthening (which Xanthe refers to as the most important), limit breaker (to summarizes the superhuman at this stage breaks through some limitations of their powers, and finally the fifth evolution where Xanthe states at this level you have transcended humanity entirely and even if all the humans banded together they couldn't stop anyone at this stage (presumably level 1s can be included in this factor).
Since level 5 superhumans underwent the strengthening stage they are more than capable of tanking WHATEVER a level 1 could FEASIBLY throw at them.
You arguing that with enough prep time and just pray to the mommy 4th that they are exhausted enough to the point a level 1 can kill them is asinie...not to mention the fact the 4th evolution allows a superhuman to do some fucking wild shit that their powers couldn't do prior the odds are stacked in the level 5's favor even with power negation, you can't rid them of their base body, their body is literally...well a tank well even more than a tank...hell I'd argue most superhumans at level 5 could move at the speed of light (depending on what gave them their power of course) so even without their power they can just move faster than whatever the level 1 prepped.
And no...the fight wouldn't be fair...it'd be a fucking massacre for any level 1 that'd even dare to try to fight a level 5.
MC a level 3 couldn't even sense monster mommy who presumably is on the same level as the level 5s or below them how do you think a level 1 would fare against someone like her? They'd die, the same way they'd die a cruel death against a level 5.
Anyway I'm too tired for this shit and arguing about it any further will go nowhere because you can't accept the simple reality that a level 1 simply can't (and never will) beat a level 5 even if they had dual traits they'd still still be sooooo far behind a level 5 even with that nifty advantage...even if you fudge the whole thing in the level 1's favor the lore and rules of the levels still favor the level 5 (yes, even with power negation).
Anyway ima go crash and watch some man vs food.