I think Murray has the potential to be a CJ McCollum / Eric Gordon type shooting guard. Worst case he's more like a Jerryd Bayless / Randy Foye type, which is not ideal, but still a useful player.
Those guys have defensive issues too, but when healthy and well-utilized have been valuable scorers who space the floor and provide secondary playmaking.
I'm not sure if Hield has the same potential, but I think he could at least be something like a Redick / Korver type off-ball scorer, with shades of J.R. Smith. I dunno if that's worth a top 5 pick, but to me it's better than gambling on a spindly 3-and-D Euro prospect with no track record against decent competition.
And if all else fails, you have Poeltl, who we know can do some key, basic things like grab rebounds and finish inside. Poeltl has a lower ceiling than Bender, but looks to have a much higher floor as an Andrew Bogut style big who provides solid defense, grabs boards, and scores in crafty ways near the basket.
The biggest thing for me with the BRK pick is I want to get an NBA player who has honest-to-goodness high level skills that the Celts can use.
Bender, or a guy like Wade Baldwin or Jaylen Brown, might have a higher ceiling. But I also think there's a good chance one or more of those guys is not in the NBA in 5-6 years.
Murray, Hield, Poeltl ... I feel confident any of them could help the Celts right away, and perhaps blossom into key starters, though likely not stars.