The takes on Jones in here are a curious read. He's renowned for taking fighters on at what their strength is, just because he can - his real intent was shown in the closing of each round when he was attempting more creative and outrageous strikes. These fights since he got back are tune ups for him going up to H/W, imo.
Testing and working on things in real fights is the only way to know where you're truly at with them, and that's what he's doing. If he really felt threatened in there, he would've gone straight to close quarters and snuffed out the threat of Santos' power, power that he felt and took on handily, btw - Jones clearly has the best chin in the division, if not the UFC, and the likelyhood of him getting inside after absorbing a hit to then smother and man-handle is greater than him getting knocked out.
If they fight again, it won't be close, I don't think. Santos lost his kicking threat early in the fight, but as we wouldn't see the same Santos in there, nor would we see the same Jones whose arsenal of tricks are far greater than the kickboxing bout we saw. What this fight did show, however, is that Jones is susceptible to leg kicking and once more that his boxing isn't what it needs to be. Him going up in weight will be a disaster when he faces the true heavies with ability as his threats aren't going to carry over if they don't respect his power or abilty to dissuade them from trying to take his head off (risk-reward). I also wonder how well his wrestling will crossover against men who will dwarf him weight wise.
It's all well and good being big for your own division; the tables will totally turn for him at HW, in that regard. Can't see it working out for him, but if it does, give him the crown of greatest mixed martial artist there has been in the UFC era.
Jonny Walker is the guy in the LHW division I think we see the more rounded, 'proper' Jones against. Jones has an incredible chin, but he can't risk it against a kicker or knee strike to the head. I think that's a bout in which Jones goes up a gear against an opponent who has a myriad of ways to trouble him and where his wrestling is not the fail-safe I believe it currently is if he genuinely feels threatened in the octagon.