Thing to remember with bookies odds are that they don't represent the sporting chance, they are designed to entice money while keeping their potential outgoings to a minimum. Thus if we're say 12-1 for the title this morning and someone lumps £250k on it our odds would crash but not because we were any more likely to be champions.
An excessive bet like the above could suggest insider knowledge (bookies really don't like that), though it could suggest blind optimism or stupidity (bookies really like those).
So what I'm saying is that adding Jota has not attracted much money to bet on us, however much we might feel he's improved our chances.