IF they insist on discrimination based on previous type, we should remember that "Size doesn''t matter".
Judging experience based on the MTOW of the aircraft is ludicrous.
What counts a LOT more is:-
1)The technological similarity of the previous type to an Emirates type.
2) The SOPs previously used
and
3) How many sectors they have flown, and where to!
Having flown an FMC equipped Boeing or ANY airbus, having operated under JAR or similar rules, and having done a shed load of sectors are all more important than having flown something big.
Steely recently stated at a training meeting that they have not had one failure of a pilot coming from a European LOCO, while guys coming with thousands of hours on Classic 747s have struggled.