For starters, you don't "buy" a credit spread. That said, you can ponder the idea of reducing risk by legging into spreads until the cows come home, but in the end, you will discover that you put on a directional trade at the jump and that it is quite possible, should you be lucky enough to have the trade go your way, that you could just close out the original position for a profit as opposed to further legging into something more complex (but perhaps "risk free").