If Tarasenko is out six months then it doesn't really change too much. We will still need to have that cap space open for when Tarasenko returns. So we could sign Pietrangelo and use the LTIR at the start of the season, but the moment that Tarasenko is ready to return we'll have to make trades where we drop significant cap. That is difficult to do during the season, and we'd be desperate to move players who we don't find important at that point. I don't think that's a viable plan, unless Armstrong can have a handshake deal with another GM for a Steen trade at the start of February, when his NTC expires.
Dunn should have good value and we have a prospect that we're high on for the medium term replacement, so I could see him being moved. Moving Kyrou doesn't make a huge amount of sense, unless it's in a package in a major trade.