That's true but the fact that #56 is much bigger than Tavon is a factor in the forces involved IMO. Tavon's leg is like a small twig compared to the weight that #56 brings to bear on it and this might/would have had a greater impact on his knee than would be the case had the leg been bigger and stouter. We don't know the answer to that but it doesn't change the fact that A) the laws of physics are always there, B) Contrary to earlier speculation, Tavon is
not able to avoid bad/dangerous hits and C) it's just a fact that a smaller player is more susceptible to injury.
Smaller players will always, as a rule, be quicker and more agile in small spaces than bigger players. There's a good reason why the NFL isn't filled with these smaller players and it all has to do with susceptibility to injuries. It's my personal belief, backed up by no data whatsoever, that most of these players suffer injuries that weed them out of the equation in HS and College long before they get to the NFL.
Draft one at a great risk IMO. As you pointed out, even big strong players like Jackson are highly susceptible to injures and why would you want to increase that risk? Especially with a high pick. If you draft player like the Tyrann in the 4th round and he doesn't last that long then it's a small loss and doesn't cost your program that much and if he somehow manages to stay healthy then you've got yourself a gem.
Too much risk for me with a high pick. Even if you didn't spend much capital on the munckin you have built your roster around an injury hole waiting to happen. What happens when you think you're set at a position? I think you look to spend your resources elsewhere and when he does get injured where are you?
This can and does happen with bigger players too but you know me -X-, I like to go with the decisions that have the math and physics on my side.

I would never gamble in Vegas but I wouldn't mind owning a casino.