Don’t know it this has been put up yet, but Eridan actually wanted to help Kanaya with the matriorb (before his meltdown, of course). He viewed the gesture of restoring their race as “hopeful,” and thus wanted to involve himself. (This becomes quite clear when you play as Eridan and speak to Kanaya directly.)

(This happens in “[S] Kanaya: Return to the core.”)
http://www.mspaintadventures.com/?s=6&p=005221

Source: http://www.mspaintadventures.com/?s=6&p=003701

Can Town makes a lot more sense now.

MindFang wrote with her left hand. When it was removed, she had to start writing with her right hand.

http://www.mspaintadventures.com/?s=6&p=005642