Not true. We could easily run the following if JP doesn't work out:
RNH-McDavid-Kassian
Kahun-Draisaitl-Yamamoto
Ennis-Turris-Neal/Chiasson
Chiasson/Neal-Khaira-Archibald
Neal and Chiasson are both good enough to be on an offensive 3rd line if Puljujarvi can't stick there.
Nope. Not enough.
Given our blueline depth we need our top 9 to be consistently more productive than what that 3rd line could pump out.