Spike,
The issue is that in John, there is no "lord's supper" per say, the only meal is the one that happens BEFORE the washing of the feet.
Also in Luke he clearly states AFTER the partaking of the bread and wine that "the hand of the betrayer is at the table with me".
To say the Luke's presentation is not in strict chronological order is based on what?
No where in Matt, Mark or Luke is Judas sent away or shown to leave, the only place he is shown to leave is in John and that is AFTER the only meal recorded in John, and after he leaves John does NOT mention any partake of bread and wine at all.
I know you are trying to establish a chronology by sorting out the events in all 4 gosples, but ut seems oyu are doing it to confome to your doctrine and it is NOT what is plainly stated.