Williams/Maye/Daniels are likely to go 1.2.3. depending on who owns the picks. Nobody is going to pass on one of those three and get Fields. Arizona isn't going to take a qb and will likely keep #4 and take Harrison. Fields isn't worth anything more than a 3rd round pick so it will take a whole lot more than the 9th and Fields to get one of the top three.
If the Bears stay @ #1, they won't stay there and pick Harrison. There are at least 3 other high quality WRs (Oduzne (Wash), Nabors (LSU) and Coleman (FSU)) that are well regarded enough to be not that much different than Harrison. Chances are all 4 of these guys will be drafted by #15. If they are smart and want to stay with Fields which is unlikely, they'd be better off trading down from one and get a chance draft a OL/DL/WR/CB in the top 15 plu whatever other premium picks they can garner.
If the Bears don't pick a QB at #1, they are more likely (and it would be a smart move) to trade to another qb needed team (Vegas, Atlanta, etc) and get multiple high-quality picks to restock their team at multiple positions. And what if NE at #3 falls in love with one of the QBs and is willing to trade with the Bears?