Twitch idea
This may be a stupid idea, but its similar to the problem with rengar a while ago where he would be invisible and you would have no idea he was there until you were dead. to fix that they put the explanation mark for rengos ult. what if they did that with twitches invisible? its obvious he is a strong pick for that reason alone (Worlds 2014 dare i say?) and if he is a smelly suwer rat you should be able to smell him invisible anyway.