On the other hand, you'd think they would have just called the top rank "admiral" instead of "rear admiral" if they didn't plan on the possibility of going higher than 50.
If they were going to add ranks (which i doubt), and follow with US Navy ranks it would be Read Admiral (Tier 2) [lvls 61-70], Vice Admiral [lvls 71-80], Admiral (Full) [lvls 81-90], Fleet Admiral [lvls 91-100]. The only way we would get a Commodore Rank is if they renamed the current Rear Admiral rank to Commodore. http://en.wikipedia.org/wiki/Commodore_(rank) The US doesn't use Commodore as an official rank but denotes a senior Captain in command of a group of ships. Oher navies (Commonwealth countries esp.) use Commodore as the first leg in the Admiralty, while the US and others use a 2-tiered Rear Admiral System.
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On the other hand, you'd think they would have just called the top rank "admiral" instead of "rear admiral" if they didn't plan on the possibility of going higher than 50.