I don't know engineering but I do know spatial relationships and if you elevate over the train station and southbound access ramp then you're also elevated over the street. Hell, you're even above the GAL factory and garage so I suppose they could even remain, but nobody wants the the garage and I expect the club and developer want to use some of the ground floor space which is why they want to buy the factory. Tunnels are built under roadways, water, and buildings all over so I don't see why putting one under a stadium would be out of the question. The question is do they want to keep that road open for the access to both the northbound and SB Deegan. I would think yes but it could go otherwise.