Okay... I'm looking at my test data right now.
Before anyone asks, I HELD the A button for all of these, AND tapped as fast as humanly possible. They both gave the same results.
As to that one kid who claims you can cancel each and every Jab with a crouch, I tested it, and couldn't simulate the effect, even in 1/4 time. As far as I'm concerned, you're fooling yourself. Unless someone I know has a lot of experience/testing ability confirms you speak the truth, I'm going to assume your theory is bunk. ,
It would be impossible to do it if your hit, but we already knew this. The exception is Marth (this is who I'm testing it on). He has non-stun frames between the two hits, so he can technically Up-B in between hits, regardless of whether he shields or not. Consistency could be an issue, but players like M2K DO exist. A lot of Fox players were frame perfect players too. Conclusion: Professional level play, Marth will not worry about Ike's Jabs. *cries*
Next, it entirely possible to shield the first hit, and roll behind Ike. This is with any character. You don't even have to power-shield. Thats never good, despite if you can Nair him. Conclusion: Every character can shield the jab and punish it. *Cries*
You can also jump, without power-shielding. You can easily follow it up with a airdodge, then jump out of range. Remember, this is assuming you don't even power-shield. I could never pull out an aerial, but remember, this is WITHOUT power-shielding, which has less lag. Conclusion: Every character can jump out of range if they shielded the jab. *cries*
Conclusion: Even without testing the abilities of powershielding, every character in the game can shield -> roll or shield -> jump Ike's Jabs. Unless you jab once, and immediately cancel into a tech-chase, you're screwed. *cries*
I'm sure Yuna is very amused by these conclusions. I can't wait to see what he'll dig up when he tests power-shielding.