Who funds seasonal businesses?

I have a prospect in the construction industry that did $675k in revenues in 2015 and is expecting $2.5 mill in 2016. The issue is that there were no deposits in January or so far in February. Oct-Dec deposits were 41k, 24k, and 44k. Many years in business, 700 credit score.

He's looking for $50k, and has mentioned paying off the loan by May.