WI: Duke of Buckingham killed in 1620?

What if the duke of Buckingham was killed in a, "hunting accident," in 1620? Would this mean that the Civil war could be avoided as he was a major source of contention between parliament and the Charles in the start? Who would Charles marry and what would this mean for the 30 years war?
 
What if the duke of Buckingham was killed in a, "hunting accident," in 1620? Would this mean that the Civil war could be avoided as he was a major source of contention between parliament and the Charles in the start? Who would Charles marry and what would this mean for the 30 years war?
I think regardless of who Charles married he likely has a closer relationship with them from the get go.

Maybe James comes to his senses and offers his son to a Protestant bride?
 
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