Gyro spends the majority of the story without a stand. This means that he managed to curb stomp most of his fights with just his steel balls and rotational techniques that anyone can learn. Meanwhile his opponents consisted of people who could alter the fabric of space and time, a hyper intelligent raptor, a man that can turn anything into a timebomb, and a man who could cross dimensions, mirroring the original Baron Zeppeli who, disregarding the Required Secondary Power of their respective parts(The Ripple/The Spin) was also a Badass Normal.
Funny Valentine can only jump to alternate dimensions/timelines in which his father perished, seemingly the one constant in his past. Presumably this is because in any timeline where Valentine's father survived, he turned out a completely different person, and in those timelines the original's Stand Dirty Deeds Done Dirt Cheap has no "reference point" to latch onto.