I would hold out for 5/2 against. Whether you'll get that would be doubtful, but he'll surely be odds against rather than odds on (they'll be many bookmakers who won't have taken a penny on him yet)... I doubt he'll go big enough for me to have an interest though.
5/2??? Cmon. If he touched that at any point the bookies would get battered. If he goes anywhere near 2s they will get battered.