We can't really know until he faces top competition. His game progressed as pre-season wore on. If he looks lost at regular season speed, send him down. The only error would be keeping him up after that point, but again, neither coaching nor management in the McDavid era has made that mistake. You're harping for the sake of harping; the anti-kool aid, as it were.
Hell, all we heard the entire summer was how Chiarelli knew he wasn't doing his job if a player like Nurse had to be on the NHL roster. He brought in ample competition at all positions, and his plan worked. The only wrinkle was an injury to the veteran winger meant to push Puljujarvi and Yakupov. That will be resolved once Versteeg returns, and you can once more sleep soundly that a position as important as third line RW will no longer be an issue- if it even was to begin with.
Except the Oilers have a pattern of doing exactly what it looks like they are doing here: putting young players in positions to fail instead of insulating them with smart, low-risk bets.
No one is being put in a position to fail. You're assuming things that haven't happened yet. If Puljujarvi demonstrates he's not ready, no harm no foul; he goes down, Versteeg comes in. Pakarinen, when healthy, will also be an option. In the interim, Puljujarvi is getting a look; there's no reason to make this out to be more than it is, save for reveling in creating drama.
Nor is it just about PJ. As someone just put it on Twitter: the Oilers are going to use their C at RW and play a rookie at C who isnt a C when two NHL RW's could have been had for nothing.
Except it's not nothing. This is not NHL 2017 on your Playstation; the number, length and cap hit of contracts all play into roster flexibility, and it makes no sense to tie up money for a short-term fix when the team has numerous options available in-house.
And, really, we all know what would have happened had those players been claimed: you'd be complaining we were enduring the Cam Barker days of retread experiments again, wasting time on another team's garbage. You're a contrarian for the sake of being a contrarian, and get a kick out of second-guessing anything and everything the team does.