What battle problem is 4-70 meant to solve?
4-70 uses 4 main contact points and a 70 height class. Lower setups generally expose less underside, while the complete Blade, Bit and launch determine the result.

Balance
Start with Hells Reaper 4-70 Kick; it is labelled as a reported tournament alternative with the note “19% of recorded podium builds · all-time”. Compare it with Rhino Reaper 4-70 Kick while keeping the Blade, stadium, launch and opponent consistent.
4-70 uses 4 main contact points and a 70 height class. Lower setups generally expose less underside, while the complete Blade, Bit and launch determine the result.
4-70 does not appear in the 20 recent winning decks reviewed by BeyXBuild. That does not make it unusable; it means the site should not call it a tournament-proven staple yet.
4-70 uses 4 main contact points and a 70 height class. Lower setups generally expose less underside, while the complete Blade, Bit and launch determine the result.
Compare 4-70 directly with the 4-60 Ratchet in the same complete build. Run at least five launches per side and record knockouts, bursts, self-knockouts, scraping and spin finishes; change only this one part.
Drop it if it does not beat a specialist in any matchup your other two Beys leave open. Flexibility only matters when it covers a real deck weakness.