One thing we must do when we talk about strength is uncersatnd what constitutes strength. If I deadlift 315 lbs 3 times and you can't do it once, one would say I am stronger than you. yet you go and do 25 pullups and I can only do 5 and they could say in that sense, you are stronger than me. Some people look more to muscular endurance as opposed to brute strength to pick up an object once.
Another way to look at it is like this. a good example: my old boxing coach and one of my best friends used to love to go to the bars after hours and there would always be someone there challenging his boxing. Of course he always kept a key to the gym. ;-) So anyway, he gets to talkign to someone we knew. this dude was a hulk. Big time weightlifter, Biceps were bulging, enormous pecs, you get the idea. Well anyway, this dude agrees to go back to the gym with us and box with my buddy. Now with all this muscle and his supposed "strength, you would think he would have done some real damage. Problem is, with all those big muscles, you have to also have a strong cardio cascualr system to pump fresh oxygenated blood to those big muscles. Well obviously he didn't have the kind of strength, what we call "functional strength. Despite those hige bulging arms muscles, at the end of 1 round he was to weak to even hold them up. Why because he was weak. he had big guns that shot blanks.You can't look at someone and be able to tell if there cardiovascular system is strong and in the real world, that matters a lot more than have "big guns"

My only point was I have learned not to measure a person's sternght by whether he was big or small. Too many times we can find outselves in a bad situation when we find out the guy is "much stronger than he looks" Matt J is a good example of that. No real big, not Gigantic muscles, but I have grappled with him many times and he is one strong SOB.
MattJ, if you are reading this we both know how Jeremy looks anything but strong, no muscles that are big in any way, skinny arms, flat chest and I don't think any of us would deny he has a heck of a lot of strength and muscular endurance as well.

Thanks for the kind words, right back atcha, bro!

Size and appearance do not have the correlation with fighting endurance/strength that many people think it does. There is another guy in our BJJ class (Kenny) that is smaller and shorter than me, but he is strong as an ox and never gets tired. Tapped me out several times.

Tough to judge by looking.

I think you'll find that when it comes to grappling it's not strength which matters as much as technique. These guys probably appear to be really strong because they've got more leverage than most people do. The more leverage you can get in grappling techniques, the less strength you actually need to have. This has been proven by the Gracies many times and is also true in my experience.

Just because a bigger person can be stronger doesn't mean they'll be guaranteed to win, far from it.