Ok... assuming all the ratings above, then, are with scouts off - let me try to explain...
The '72 ratings you pulled from the Lahman DB were based on his '72 statistics (or possibly the balance of his career - depending on how you answered that setup question).
Code:
Year Ag Tm Lg W L G GS CG SHO SV IP H ER HR BB SO ERA *lgERA *ERA+
1972 27 PHI NL 27 10 41 41 30 8 0 346.3 257 76 17 87 310 1.97 3.59 182
You then played one season and got the results you posted.
The '73 ratings, however, were based on his '73 season (which was not as good as '72 ...
Code:
Year Ag Tm Lg W L G GS CG SHO SV IP H ER HR BB SO ERA *lgERA *ERA+
1973 28 PHI NL 13 20 40 40 18 3 0 293.3 293 127 29 113 223 3.90 3.82 98
Hope that helps