Partition of the Hapsburg Empire

So, the HRE Leopold I had five sons born over the course of his three marriages:

Ferdinand Wenzel (1667-1668)
Johann Leopold (1670)
HRE Josef I (1678-1711)
Leopold Karl (1682-1684)
HRE Karl VI (1685-1740)

I've seen it proposed in several TLs that Leopold partitions his empire (either before (so as to avoid) or after the War of the Spanish Succession), with the eldest son taking the Empire, the Habsburg Netherlands and the Habsburg Inheritance of Further Austria, Tyrol etc; and another son (usu. Karl VI) getting the kingdom of Hungary-Bohemia.

If a third son (say Leopold Karl) had survived, would this idea have been put into practice as say: Emperor Josef, King Leopold II of Hungary, and King Charles III of Spain? Or would another plan have been devised? What might the results be of a threeway split of the Habsburgs (butterflying away of course the fact neither Josef nor Karl had surviving sons). And would as pointed out in the one thread, it actually strengthen the Habsburg hold on the Empire or weaken it?

Thoughts and feedback appreciated.
 
Considering that the Austrian Habsburgs had made sure the same person was elected to the thrones of both Bohemia and Hungary since Emperor Ferdinand I, I do not see that practice changing if Leopold Karl had survived. I could see Leopold I granting his succession rights to the Spanish empire to Leopold Karl in TTL. Leopold I would likely grant both Leopold Karl and OTL’s Karl VI their own Austrian archduchy. Leopold I’s succession plan in TTL: Karl inherits Tyrol, Leopold Karl inherits Styria (and the claims to the Spanish empire), and Joseph inherits (or elected to) the remaining Austrian archduchies, Hungary, Bohemia, and the Empire. The war of the Spanish Succession would still be fought in TTL, but unless Leopold Karl is both a military and political genius, I do not see him ruling Spain in TTL.
 
Considering that the Austrian Habsburgs had made sure the same person was elected to the thrones of both Bohemia and Hungary since Emperor Ferdinand I, I do not see that practice changing if Leopold Karl had survived. I could see Leopold I granting his succession rights to the Spanish empire to Leopold Karl in TTL. Leopold I would likely grant both Leopold Karl and OTL’s Karl VI their own Austrian archduchy. Leopold I’s succession plan in TTL: Karl inherits Tyrol, Leopold Karl inherits Styria (and the claims to the Spanish empire), and Joseph inherits (or elected to) the remaining Austrian archduchies, Hungary, Bohemia, and the Empire. The war of the Spanish Succession would still be fought in TTL, but unless Leopold Karl is both a military and political genius, I do not see him ruling Spain in TTL.

IDK, I would imagine that they would split Hungary-Croatia-Bohemia off as an "single" kingdom, and the Habsburgs would thereby be stronger since their resources are not being continually sapped by the Turks and the rebels in Hungary.
 
I would think Bohemia staying with the HRE hapsburgs makes more sense than it going to Hungary long term.
 
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