Lombard vs Stann would be too sick. I'd go with Lombard via roundedness plus the speed advantage. Stann does have wicked power, but so does Lombard and Lombard speed would let him get there faster. Honestly I think Lombard would stop him via their aggressive styles. Stann is real hittable too. 2nd or 3rd round TKO due to Stanns chin and slight size advantage.
HW: Barry, JDS, Fedor LHW: Shogun, Mousasi MW: Wand, Belcher WW: Alves, Condit LW: Aoki, Showtime Pettis FW: Aldo, CSJ BW: Renan Barao FlyW: Sergio Pettis StrawW:Rambaa M16
Say what you want, Jose Aldo Jr is P4P number 1.