A tsunami moving west to east has a very good chance of blasting through the Sunda Strait but in most scenarios there does not appear to be significant damage (easy to say as it is not my house, my auto or my life) to the northwestern coast of Java (including Jakarta) or the southeastern coast of Sumatra, However, in most scenarios the southern coast of Sumatra and the western coast of Java sustain gruesome damage.
By Indonesian standards the six events in a century shown above are not significant.
There is some agreement that the dozens of R6s with epicenters outside the Sunda Straits have neither increased nor decreased the chances of some version of Krakatau causing another catastrophe. R6.0 or greater epicenters in the last century shown below. No clusters yet.