Clowns keep receiving Ls.
See how the combined force of 3 future Yonko including Whitebeard with his strongest paramecia fruit Gura Gura no Mi and Meito bisento still chose to run away from Garp, because their 3 vs 1 fight would still "drag things out".
Meanwhile
It only took seconds for Shiryu to critically weakened Garp with his single attack.
"But but Shiryu is too weak to be Whitebeard's parallel"
"But but Suke Suke no Mi is trash compared to Whitebeard's Gura Gura"
Now the table has completely turned
Whitebeard is too weak to be Shiryu's parallel.
One stabbed through Iron Garp, critically injured, weakened and retired him, and the other was loser of bygone era.
Gura Gura couldn't do shit to Garp, while Suke Suke helped Shiryu in taking Garp down. Sure: Gura Gura > Suke Suke, we can't deny the author's own words "Gura Gura is the strongest paramecia" but the quality of its user matters.