I also heard another modern (post WWII) gadol (I heard the name but I forget which) married someone he knew was a very nervous woman.
I can easily find out the name of the person, but I won’t ask the person who told it to me, because when I heard it, I didn’t believe it for a second (that he married her as a cheseed because he knew she had mental issues and would have a hard time finding someone to marry her).