Even after making weight, I'd probably still be at least one weight class above Manny, so I doubt I'd ever get to meet him. Still, assuming I were lighter or an open-category fight, I'd do pretty much what you guys would and aim to keep the fight standing with good ring generalship and defensive grappling. Training-wise, I'd focus on outfighting and counterstriking and probably aim to find a good wrestling coach during the prep to work on negating his judo skills and keeping the pressure on. Him being smaller than me really doesn't mean anything - all the most dangerous grapplers I've ever rolled with were smaller and lighter than me.
During the fight itself, I'd have a definite reach advantage on him, so I'd aim to keep him at a distance with headshots and punish the body every time he gets too close, sprawling against takedown attacks and aiming to spin to catch the back and rain down punches from a loose mount, jumping clear of any sweep or counter attempts as they come. I doubt I'd actively attempt any takedowns - he'd be the better grappler by far, so I'd rather wait on his takedowns and Murphy his game to hell to tire him out.
Basically, punish with reach and striking power at range, and with bodyweight and leverage in the grapples, and hope my conditioning lasts long enough to whittle his down with damage and workrate.
Now my brain has blown its sticky load, I shall yield the floor to the next gent
