WI: Holy Roman Empire includes West Francia but not East Francia (Germany)

I'm not exactly sure how this would happen, but I suppose the easiest would be for an Otto the Great analogue to be born in France around the 950s. What I'm interested in are the effects of such an arrangement on the development of Germany as a nation, does it become a strong centralized kingdom like France did OTL? How does that change European politics?
 
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