How did it do that ??

It parsed your XML and memorized your intent
It resolved your query or wildcard
It divided the list of files in N jobs of each25 files ... Resource Brokering happened at this stage i.e. each .csh was produced to run optimally according to polocies
Not that since there was no specification (in the first example) of where the result should end up, it can in principle start ANYWHERE in the world ...
YES, the Scheduler IS Grid aware !!

It parsed your XML and memorized your intent