This is a very weird opinion, but if Demon1 replaces Icy, G2 might be a contender for winning champions. G2 are a slow and methodical team, which is Demon1's playstyle. He usually gets inserted into an area and pops off with supportive util from the rest of the team, which would fit him perfect on G2. It will also add the needed solo player carry and firepower to let them rise to the top. As Icy is right now, yes, he plays well, but he is not a good enough duelist or player to be able to lift up the team when it is needed.
Only problem I can see is that Demon1's raze is not ideal, but I definitely think the team can work around that, or let him learn the agent to play in pro play.