walter's body count is a lot higher than 3 or 4. starting from season 1, death's directly involving walter via him doing the killing or ordering it: Emilio, Krazy 8, Jane (he watched her die and did nothing, i'd say that counts), the two guys who planned combo's death, hector, tyrus, gustavo, mike, and lastly the 10 prison murders, coming in for a total of 19.
and you cant call spoiler alert on something that hasnt happened yet. did you watch the last episode? walter and skylar made peace because walter claimed he was out of the game.