I'd rather have the headaches of AB and Bell than DJ.
Say what you will about them, but until the end, I never once questioned their effort on the field. It never seemed to affect the offense, either. Those offenses were top 10-top 5 type offenses and that's with a mediocre at best OC. The only thing I'd say is that they spent A LOT of money and draft capital on the offensive side and that played a role in why they were routinely giving up 40 points in the playoffs.
DJ, on the other hand, actively did not try. I'm not even just talking about the time he didn't block or didn't try to recover the fumble, although those were pretty glaring. The constant running backwards, out of bounds, or giving himself up so that he didn't take a hit is the type of stuff that drives me crazy. I think that actually has a negative impact on the team because other guys see that and think (even subconsciously) "If that guy isn't giving it his all, why am I?" Doubly so when he is being rewarded with the most targets.
I know Pickens had the 1 time he didn't block and I don't want to downplay that, but he just strikes me more as AB/Bell type than DJ type. That's still a big risk because both of those guys hung the team out to dry at the end. Those offenses were built around those guys and to not have them when you needed them is essentially wasting a year. Pickens could be better, could be worse, but if you get 4-5 years out of him being a top 5 WR in football, I think you take that tradeoff. Especially while you only have at best a few more years of Russ and Heyward, a few more years of prime Watt, etc. This team is setup to compete for the next few years and not having a true #1 WR would be a major blow.