Manafort is accused of money laundering $18 million.  Just to make a point, let's assume that Manafort will be convicted of that…
so what?  those crimes were committed BEFORE Manafort joined the Trump team!  
Let me re-emphasize this.. the implication is that Trump's campaign was funded in part by the money laundering of Manafort... however, the charges against Manafort's money laundering specify a time period BEFORE Manafort was working on Trump's campaign.. Therefore.. it's impossible that whatever money was generated was done so for Trump's campaign.

You are an avid reader of news articles, to your credit.  Surely you are aware of the copious reporting and analysis on the potential for a "Manafort Flip," where Mueller's investigation gathers evidence of his earlier wrongdoings as leverage to cut a deal for juicy testimony on all the (must we use "alleged", lol?) Russian collusion:

http://www.nydailynews.com/news/national/mueller-flipping-manafort-article-1.3598880

…and a great quote from https://abovethelaw.com/2017/10/this-31-page-manafort-indictment-feels-like-flip-bait/

"If somebody had told Paul Manafort, “You’re going to run the Trump campaign for a couple of months, get humiliated and replaced by Steve Bannon, then have your whole life picked through by a former director of the FBI while the president pretends to barely know who you are,” I’m sure he would have given the job a hard pass."   :cheesy2: