I thought MS version is 1:1?
It is - but you need to need to tie up money with Morgan Stanley to qualify to get that card (ie, $5k to meet the minimum requirements of the robo advisor account to establish a qualifying relationship). If you only have Access Investing, you also have to time your cash-out to pull the dollars before the robo advisor invests the newly deposited funds.
For anyone looking simply to cash out MR, opening a completely free Schwab account and redeeming at a 10% higher cash price is clearly the better option.