What battle problem is 5-70 meant to solve?
5-70 uses 5 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 Brachio Whip 5-70 Narrow; it is labelled as a official stock pairing with the note “Takara Tomy CX-18”. Compare it with Samurai Steel 5-70 Gear Flat while keeping the Blade, stadium, launch and opponent consistent.
5-70 uses 5 main contact points and a 70 height class. Lower setups generally expose less underside, while the complete Blade, Bit and launch determine the result.
5-70 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.
5-70 uses 5 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 5-70 directly with the 5-60 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.