Two Braves who inspired a rain dance

Warren Spahn and Johnny Sain were dominating pitchers for the Boston Braves in the 40s and early 50s. So good, the duo inspired Boston Post columnist Gerald V. Hern to pen the following in his Sept. 14, 1948 column:

First we'll use Spahn
then we'll use Sain
Then an off day
followed by rain
Back will come Spahn
followed by Sain
And followed
we hope
by two days of rain.

I have read, but can’t confirm, that the poem came about after Spahn and Sain started consecutive games for the Braves. Subsequently, there were several days of rain that forced postponement of a couple more Boston games. Those rain outs allowed the Braves to skip through the rotation and start Spahn and Sain when the team resumed play. Were the other Braves' hurlers that bad? I don’t know if the above account is true, but it makes for interesting baseball lore.