I think the early investors will determine if Gram boosts the markets. I expect however that if they sell, they can make a nice profit even if prices are so-so, assuming there is enough liquidity. And of course that may decrease interest in the coin if they dump the markets.
Question though is if they are allowed to sell yet? It's also possible there is a waiting period, like a year or so, depending on the terms when they bought. I haven't kept track of it, so no idea if they can sell when markets open or not.
I assumed any exchanges currently selling Gram are just selling IOUs? Kind of like futures, which is a bit of a risk.