The anesthetic referred to is succinylcholine and it stops breathing by paralysing (or "relaxing") the bodies muscles (including the chest muscles through which one breathes i.e. the intercostals). It follows that: 1) suffocation by manual means would be unnecessary (after all, he wouldn't be breathing) and 2) if he was paralysed how on earth did he "resist" their efforts to suffocate him? And if there was clear evidence that he resisted, why did it take the Dubai police 10 days to realise that he had been killed? The credibility of the Dubai police is in tatters; it would be amusing if it was not so pathetic.
Firebomb thrown during demonstration in northern Israeli town of Umm al Fahm (Haaretz)
from the article: Report: Hamas chief survived two earlier assassination attempts