Pardon me, yes, directly your graph compares DOH, ergo indirectly it compares age. Yes, you were merged with pilots who were hired after your date. However, that's only one yardstick and the one that conveniently advances your case.
Using the other yardstick, those younger pilots brought higher-ranking jobs to the merger. For example, at the time of merger, fifteen years of service at Air Canada comfortably held A320C and pilots with as little as 5 years of service were holding that seat.
At CAIL, 15 years generally held right seat of the A320 with the junior YZ B767F hired November 2, 1987. Your junior YZ B737 Captain was hired March 31, 1980. Our junior DC9 Captain was hired January 20, 1997, less than 4 YOS. Same job, demographically two decades apart.
To merge DOH or LOS would give the CAIL pilots a significant leg up at the expense of the OAC pilots. Pre-merger, all parties agreed that the goal was to preserve pre-merger career expectations. Even with a less-than-YOS award, over the past three years CAIL pilots have realized career advancement. Many of the aformentioned CAIL F/Os have taken A320 left seats while OAC pilots have stagnated or slid backwards.
So, to answer your question- it appears that your side "won the seniority battle" at our expense.