Ichigo hasn't had sex yet, but he'd surely be faster.
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Just because he made it up doesn't mean it's off the mark entirely, it clearly moved while Ichigo was looking straight at it. Ichigo had no idea how it moved, yet he was STILL able to dodge it and even counter it multiple time, and that was only Ichigo's Bankai, with no hollowfication. Dangai Ichigo is Tenza Zangetsu, Ichigo, and Full-Power Hichigo combined into one, and thats after Ichigo trained for like 3 months and was ALREADY able to fight on par with Tensa Zangetsu/Hichigo combined.
His power was 2 dimensions above the Soul Society, which we can safely assume, since Aizen is 1 dimension above the Soul Society after absorbing the Hogyoku and letting it take its course. Even at Full Power, Aizen was never even close to a match for Ichigo.
Considering how powerful non-evolved Hogyoku Aizen was, and that he was able to take out the entire Soul Society on his own, we can safely assume he is also LEAGUES and LEEEAGUES above Gin.
Of course, that doesn't mean a speed boost, or does it?
If Aizen wasn't fast enough to Dodge Gin, Gin could damage him pretty easily.
Ichigo was able to move faster then Aizen's hypnosis could even work, considering he was able to nearly kill Aizen, and Aizen was noticeably afraid.
Being leagues above someone doesn't quantify any kind of boost like you're suggesting. For all we know, Gin's sword could have been moving at a scant mach 50, or even less. The simple fact of the matter is that from mach 1, something greater than that could be mach 1.1, and something greater than that could be mach 1.2, and from that perspective, mach 1.2 would be much faster than mach 1, see? Ichigo's speed >>>>> Aizen > mach 20 can put Ichigo at anything from mach 25, up.
You're just assuming that the difference is that great, for no reason, with absolutely no proof.
And uh, Aizen didn't use hypnosis on Ichigo after going hollow because he COULDN'T. Ichigo even said that Aizen's sword was empty, because he traded it for hollow powers. Nothing to do with Ichigo's speed. If that were the case, Ichigo would have been FTL, considering Aizen's shikai works by using sight. And even current Ichigo is barely faster than lightning.
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Anyone on KMC, go argue with those highly intelligent guys, guarantee they tear you apart.
However, one dude said 5800, with the average being 1800, one dude on google answers calc'd the fastest lightning bolt ever recorded at over Mach 58,000.
That would be ludicrous, however, don't argue with me, argue with the guys on physforum, you know, the ones who discuss stuff like this one a daily basis.