I encountered one of instances of the phrase, and it appears to be some kind of idiom.
- Douglas′ Proposals for a National Dividend: A Logical Successor to the Wage
- Why Donald Trump Is Obama’s Logical Successor
- Is the CFO a Logical Successor to the CEO?
I can somewhat vaguely grasp the idea, but what does the phrase exactly mean? A due successor? A de facto successor? A theoretical successor? Or some other ways to understand?