I still think the Mantis dev is the Spark coin dev. Now that the coin is forked he will probably abandon it.
Mantis dev and Spark dev both couldn't compile Mac wallets and their main developments include some kind of interest rate system.
Ann Header for Mantis:
[MNS]|Mantis|X11|PoW/PoS|MantisReward|MantisUI2.0|MantisChat
Ann Header for Spark:
[ANN] Spark|X11|PoW/PoS|BTer|Launched|UPDATED|Job Opportunities
He keeps the premine intact...Mines before the launch and then dumps
From the earl review:
* MODERATE: Somewhat unfair launch. Reports of source being released after binaries, and the official pool before source was released