Both DJ and Aldo have a case for a better run than GSP. Both had more defenses, finishes, and wins.
I agree, though, that GSP's is ultimately more significant because of the weight class. As great as they are/were, the little guys just fall short in comparison because they're little. No offense meant, they're fucking beasts, just small.
I'd consider Aldo's run to be close to GSPs. He has a lot more finishes and FW was quite stacked.