I think Roma has the right to buy the half of Motta at 3.5M and the whole for 7M.
How is possible that Roma can't even pay 3.5M is beyond me though.
As for Criscito case, never undertand well the situation. According to Juve's official site, Genoa can buy the half of Criscito for 5.5M (the 1M loan fee they paid to Juve included, I think, judging from the Gourcuff case). However, according to some rumors, Genoa can buy the whole of Crsicito for 7.5M (someone else said 7M). Don't know where this came from.