Way to go on all the snappy comebacks, people! Seriously, well done.
First off, if the OP only "overheard" this guy say he had 100 dives, isn't it at all possible that this was taken out of context? Maybe he only had 100 dives this year, 100 dives at XYZ Point, or 100 drysuit dives? Without hearing from the guy myself, I'm not prone to put a whole lot of stock into the credibility of it.
Second, you need 25 experience dives between each GUE class. Fundies typically takes 6-8 dives, and Tech 1/2 take about 8 dives each. Add in 5 dives for a basic OW cert, and that's a bare minimum of 77 dives to get to the Tech 2 level for a wunderkind who takes Fundies the day after PADI OW, and passes everything with flying colors.
I don't like to judge people by the number of dives. There are some really good divers without much experience, and some really bad divers with tons of it. Like a lot of folks have said, there is no substitute for diving with someone to know what kind of diver they are; not only their skill and knowledge, but also their attitude. My main concern about diving with a wunderkind like we're discussing is WHY they would bother being certified to dive Hypoxic Trimix with only 100 dives...
The great lakes have tons of wrecks. I did my first dive on the Willie in 2006. Since then, I've made half a dozen dives on that wreck alone, and I am still seeing new things on every visit. The shallower wrecks are just as interesting as some of the deeper wrecks, they are more accessible, and you can stay down on them much longer. Once you get your normoxic trimix certification, you have access to even more cool wrecks. You can't possibly scratch the surface of these wrecks after 100 dives. What does this tell you about the attitude of a Tech 2 diver with only 100 dives under their belt? What is their primary goal?
I would be very concerned diving with someone like this. Even if they deserve to be there, the speed at which they are taking things tells me they are not the type to slow down and smell the roses. They have obviously pushed themselves very hard to get there so fast, and I would be concerned they would push me as well. Diving is a sport that requires a certain degree of discretion. Unless I know a lot about this person's motives, I would be careful diving with them to any depth.
Tom