Some of these are suspect partly because the QB’s in the 60’s and 70’s were part of offenses that operated around a running game. Back then if a QB threw for 200 yards that was a pretty good day. Nowadays a QB would be expected to throw for 300 yards.
As I recall SB X, Roger did not have the kind of day he was accustomed to. Out of 82 QB SB performances, I'd say number 50 is about right for that particular day. It was not his best day for sure, but the Steel Curtain had a lot to say about that.
You notice he is also in the top 20 for losing QBs (SB XIII.)
Now that was a great game that went down to the wire. One of the top 2 or 3 SBs ever, IMHO.