Nineiron - you are in danger of taking this thread off into yet another Pprune jungle where wild and unsubstantiated comments will degrade the value of a 'news item'.
Three assumptions you (appear) to be making/hinting at:-
1) The gear was retracted after take-off - do you KNOW that?
2) The crew knew about the smoke/???/fuel leak at the point where gear is normally retracted - ditto ditto!
3) The cause was a fuel leak - ditto ditto ditto
Can I plead for a little more FACT and less SUPPOSITION from all?