Take a look at his record. His best win is a decision over Shlemenko. Not many people can go on a 20 fight win streak in MMA, I'll give him that. But, it's all against mid-level competition.
For me Lombard is an unknown.
I think he would be an ok fighter in the UFC. But I highly doubt ever top 5 MW. Maybe on the back end of the top 10.
He really gets overrated by some people. He is devastating, but what about his technique? Cardio? Wrestling? Patience against a real MMA fighter?
So far he has beat up most all cans. Hard to really say.
If he stays with Bellator we will basically know that he knows he wouldn't do well in the UFC.
There is no good reason to stay in Bellator forever when the UFC is offering a contract. If you win in the UFC you move up in pay. If you get KOs like he wwas in Bellator he would rack up KOTN awards. Only good reason is that you are comfortable with being the big fish in a very small pond.
Ultimately the man is 34 years old. He has a 73 inch reach. And stands 5'9. And has fought 1 legit guy in his whole career and lost. Plus he doesn't have much of a name. So I'm not all that sure that the UFC is clamoring over the thought of getting him. They probably made him an alright offer...and if he stays with Bellator it will be now sweat off the UFC's back.