Why are people equating 5 games to a whole season? At his peak Horford was a 3rd best type player on a title team and he has pretty steadily getting worse. If Boston had signed Durant then Horford made sense but on his own it was a bad signing because he just isn't good enough.
But let's say we make the ECF and lose to the Cavs with Horford contributing as greatly as he has been so far (and yes, it's only been 5 games of a potential 21), but let's say we get to the ECF and he keeps averaging 15/6/9.5 with his solid D...
You wouldn't say 'sign me up right away'? Because I would.
Al's 3 point shooting has been very, very good this year as a 7 footer which has changed our offense and spacing for IT. It's not just his good, solid play. It's his versatility on offense that has made IT become a top 3 scorer. and given us a legitimate post presence, something we haven't had since KG. A post threat that has the best assist numbers in the NBA of all centers. Imagine him on a team with a few more consistent scorers like Paul George or Butler catching his crisp perimeter passes.
Also important to remember that he missed almost 2 full seasons with the torn pectoral injuries. That's 2 less seasons of NBA wear on those legs- which should give him some kind of benefit as he gets older. He's been a top 20 NBA player in the playoffs so far.
If he continues and we succeed and he keeps up similar numbers, then hell...
Sign me up all day every day.