1) Becker is only 2.5 years older so even with him being an early bloomer he is not from another era than Andre (aren’t you the one arguing that even 5,6 years difference are from the same era?). Becker and Agassi played mostly the same players even if at different stages of their careers. Becker had more battles with Lendl and Edberg, but Agassi had to deal with young Pete, prime Pete, peak Pete and strong versions of old Pete, as well as getting the beginning of peak Roger who may well have denied him another USO and a YEC (arguable whether he beats Hewitt in the USO 05 but he was in great form and 2004 would also have been a chance). Agassi had some weak draws at the 2001 and 2003 AO, but he also had tough draws in other deep slam runs where he did not win (he also has three more additional slam finals than Becker). All in all there is not much difference between Becker’s and Agassi’s competition.
2) lol at calling a guy pathetic for having three slams at 27, which is an arbitrary cut-off anyways. Chang had more slams at 17 than Djokovic, is he the greater player?
3) slams were not the be all end all but for neither of them, otherwise Agassi wouldn’t have skipped so many AOs and Wimbledons. The best of 5 finals stat implies Becker’s superiority at YEC/GSC/WCT which I said, is a strong point for him, but does not outweigh all the other stuff Andre has over him.
You put too much stock into top ten wins. Boris winning percentage against top ten is excellent never denied that so is his H2H against the greats of his era, but this is not the most important statistic, especially not in the 90s, where conditions were way more polarised than today (beating Muster at Wimbledon or Pete at RG would have counted as top ten wins).
By what old-timers? Any sources? 23 years ago, Agassi was still playing and had to yet win two slams. Winning all slams was always important, Borg desperately wanted to win the USO, Pete the FO and Mac until today is haunted by the 84 FO final (I leave out Lendl, because his missing slam was Wimbledon).
I am a very big fan of Becker believe me, my third most favourite player. But he is not above Agassi in career achievements.