Just installed WordPress SEO – Can i remove "Google XML Sitemaps" plugin?

@einstem, some time ago I was in your situation and it happened that when I removed the Google XML sitemaps plugin my indexing suddenly dropped down, although the Yoast sitemap had already been sent. So I had to keep the two plugins together for a long time, because when I tried to deactivate Google XML sitemaps again some months later, the same happened. Then, Yoast sitemaps are a bit unstable, so I have always thought that the other map was a guarantee, and indeed it was. When the Yoast maps are broken the other holds on because it was physical, not dynamic as that of Yoast.
Then recently, with a Google XML sitemaps plugin upgrade I didn’t like, I tried to turn it off again and nothing bad happened for weeks, so I deleted it completely and I removed maps from the root of the site. This time I haven’t had the previous experience, in fact the opposite has happened, right after having removed GXML indexing has increased of 10-15%, this is strange and I don’t know why.
So, in theory you don’t need to send two equal maps and you don’t need two sitemap plugins, but actually this is what happened to me, so try first to deactivate Google XML sitemap plugin, and check in the following days with the Google webmaster tools, if something goes wrong you can activate it again.