Well that makes sense and I think that @Stark's theory doesn't outright deny that. Maybe the shards feel the need to, as you said, enact their intents but if the Shardholder really doesn't want to they can resist it? "Hold their breath" and get away?
To quote the Coppermind on Survival Shard:
So, a natural process for him would be to Invest and act according to the aspect of Adonalsium they represent. But Survival Shard (nickname, not canon), or rather its Shardholder, presumably got scared of what Odium was doing and decided not to Invest and avoid splintering.
But that raises a question - why didn't he Invest shortly after the Shattering like the other Shards, before Odium started to take action?
Going with @Jondesu's explanation - maybe his Intent didn't require him to invest, like Odium, and he didn't really feel the need to be tied to one place and so he just floated in space. Then he saw Odium's effect on Sel and Roshar and decided that he will definitely not Invest, thank you very much.