Yes.. Then just to put the police off the track suggest the other two have been sedated
If we look at it logically, all 3 kids would have to be sedated in the same way to ensure they were not disturbed.
So the risk of one of them getting up and mooching around or looking for their mum and dad should be negated - that would be the primary reason for doing it (according to those of a sceptical bent).
If we take that logic and apply it further by suggesting that all 3 kids would have been administered the same dose, it would stand to reason that MM would be the most likely to be physiologically able of the 3 to withstand / resist (for want of a better phrase) said dose and would therefore be the most likely to be able to rouse herself and potentially wander.
If this did occur, and I doubt it did, then this would have at least been the 3rd of 4th time sedation was used, given the testimony of the parents themselves that going out / monitoring was the established routine, albeit only 3 days.
If we then take the disputed account of Mrs Fenn, who heard a child crying for a prolonged period, an account corroborated by Kate herself, although not in its entirety, then there was opportunity on this holiday alone to adjust the sedative dose accordingly.
I don't see how all of this fits with a fatal accident that resulted in a significant fall, however. Surely overdose or anaphylactic reaction would be the most likely mode of death? Therefore this apparent spattering of bodily fluids would not occur (unless resuscitation was attempted, even then, I don't see it personally).
This is probably all off topic, so I apologise, but this sedation theory has too many moving parts for me.