For Zero armor ?
Let s look at a old sonic game since there bigger chance more ppl here will have played it.

Im sure many remember metal sonic or even last battle against robonic in Sonic 2 on sega. They have just as strong if not stronger armor then Zero. While it might not pierce through Zero armor it would at least damage it ! Bending peice making his mobility even less.

You trying to say that cause he can compute possible attack against him he has the reaction time. Thats totaly untrue he is limited by the speed of his poor carcass.

When you look at Sonic while on top speed it is hard to even be able to keep up whit him. While Zero Top speed isnt actualy even fast it could be compared to Sonic fast walking.

How can Zero freeze sonic if he cant hit him ?

Zero Teleport ?
Zero only chance would be to teleport to hit where Sonic would be when he done teleporting but then again Sonic can just go in a random direction as he see Zero teleporting.

Zero use his shadow ?
There again sonic would see it and be able to keep an eye on his real target.