I agree that the request will be a test of whether the USA will honour its agreements.

I believe the correct pathway would be for the US to return him to the UK and the UK to the appropriate place (unless maybe he claimed asylum).

I d not follow the logic of your last paragraph. If the LET is creature of Pakistani government forces why did they not ask for Rahmatullah back from Baghram?

Some information about LeT here - http://en.wikipedia.org/wiki/Lashkar-e-Toiba. Te view that it is an ISI construct ins not universal.

Information stating it to be Sunni here http://www.fas.org/irp/world/para/lashkar.htm

and here http://www.boston.com/bostonglobe/editorial_opinion/oped/articles/2009/06/17/the_other_islamist_threat_in_pakistan/

and here http://www.bbc.co.uk/news/world-middle-east-11923176

and here http://publicpolicy.stanford.edu/system/files/SunniMilitancyIndia_DIA.pdf