I will take Bird's 3 best statistical season compared to Duncan's best 3.
Bird:
84-85: 28.7 ppg, 10.5 rpg, 6.6 apg, 1.6 STL, 1.2 BLK, 52.2% FG, 88.2% FT, 3.1 TOV in 39.5 MPG
86-87: 28.1 ppg, 9.2 rpg, 7.6 apg, 1.8 STL, 0.9 BLK, 52.5% FG, 91% FT, 3.2 TOV in 40.6 MPG
87-88: 29.9 PPG, 9.3 RPG, 6.1 APG, 1.6 STL, 0.8 BLK, 52.7% 91.6%, 2.8 TOV in 39 MPG
Duncan:
99-00: 23.2 PPG, 12.4 RPG, 3.2 APG, 0.9 STL, 2.2 BLK, 49% FG, 76.1% FT, 3.3 TOV in 38.9 MPG
01-02: 25.5 PPG, 12.7 RPG, 3.7 APG, 0.7 STL, 2.5 BLK, 50.8 FG%, 79.9% FT, 3.2 TOV in 40.6 MPG
02-03: 23.3 PPG, 12.9 RPG, 3.1 APG, 0.9 STL, 2.7 BLK, 51.3 FG%, 71% FT, 3.1 TOV in 39.3 MPG
On the surface, it's obvious Bird is better offensively (more points, more assists, better shooting %s), while Duncan is better defensively, more rebounds, blks + stls). Minutes and TOVs are about a wash.
The biggest difference between the two are PPG (with Bird being consistently about 20 to 25% better), rebounding (with Duncan being consistently 25 to 30%), and assists (with Bird being about 100% better consistently). So I am not sure how you can say Bird would make Duncan's stats look " ty".
Of course, we haven't even talked about the drastic shift in playing styles in the 15 years in between because of the Pistons and Knicks.
When you normalize the numbers based on league average, the numbers look to favour Duncan slightly. The following numbers are % of each player's production as compared to an average team in that particular year. IE, if Bird scores 25 PPG, and an average team scores 100, Bird scores 25% of an average team's points. If Bird shoots 90% from the FT like, and the league average is 80%, Bird is 112.5% of league average.
Bird:
84-85: 0.259 PPG, 0.241 RPG, 0.251 APG, 0.187 STL, 0.226 BLK, 1.063 FG%, 1.154 FT%, 0.174 TOV
86-87: 0.256 PPG, 0.209 RPG, 0.293 APG, 0.209 STL, 0.163 BLK, 1.094 FG%, 1.193 FT%, 0.188 TOV
87-88: 0.276 PPG, 0.214 RPG, 0.237 APG, 0.188 STL, 0.148 BLK, 1.098 FG%, 1.196 FT%, 0.167 TOV
Duncan:
99-00: 0.238 PPG, 0.289 RPG, 0.143 APG, 0.113 STL, 0.425 BLK, 1.091 FG%, 1.015 FT%, 0.213 TOV
01-02: 0.267 PPG, 0.3 RPG, 0.169 APG, 0.09 STL, 0.479 BLK, 1.142 FG%, 1.063 FT%, 0.221 TOV
02-03: 0.245 PPG, 0.305 RPG, 0.144 APG, 0.113 STL, 0.539 BLK, 1.161 FG%, 0.937 FT%, 0.208 TOV
Adjusted for eras, Duncan appears to have a slight upper hand on bird, with the gap in the scoring difference significantly lower, having a better adjusted FG%, and a closer APG ratio.
Duncan compares favourably, or at least within reasonable range, of Bird's best season. Put in the fact that Duncan was more consistent for a longer period of time than Bird, and won more championships, there is a good point to be made that Duncan > Bird.
Finally, Duncan did have at least one HoFer by his side at all times, but so what? Robinson was way over his prime by around 01, Parker and Ginobili wasn't even half of what they are later on in their careers. Speedy Claxton and Kerr actually replaced Parker during crunch time to make significant comebacks for the Mavs game 6 and Nets Game 6. Ginobili was a bench player who would average around 10 ppg, these are not players at their prime, it's like saying Kobe Bryant can't win a ring with 3 other HOFers beside him, despite the fact that Shaq was on the downward side of his career, Malone was on his last legs (and injured in the Finals), and Payton was a s of his former self.
Besides, Ginobili will get in the HoF because of his international accomplishments, not his NBA accomplishments. Parker, at best, is a maybe HoF candidate. It's like saying Kobe can't win a ring without another HoF player because of Gasol.

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