If you apply ED, you are basically committing to the school if accepted. So they know they have you and can offer you less financial aid because they don’t need to entice you.
My experience with my daughter and her friends (we are local to Boston and a LOT of people from her high school go to Northeastern) is that it’s common to get merit aid, but that’s usually in the neighborhood of 10 to 20k per year, and Northeastern costs more like 70k per year, if you include room, board, tuition, fees, everything.
My daughter got a $12,000 per year Dean’s Scholarship (we didn’t qualify for any need-based aid), and her stats were right in the middle of the accepted applicants.