Conversation so far:
What were some significant line up changes for Helloween?
Helloween parted ways with guitarist Roland Grapow and drummer Uli Kusch.
Who were Roland Grapow and Uli Kusch replaced with in Helloween?
They were replaced by guitarist Sascha Gerstner and drummer Mark Cross.
Was there tension between the members of the band Helloween when Roland Grapow and Uli Kusch left?
One version of events states that Weikath, Deris, and Grosskopf felt that Kusch and Grapow, were spending more time on their new side-project, Masterplan.
Did any other band member leave Helloween during the early 2000s?
Stefan Schwarzmann was replaced by Daniel Löble.
How did the band Helloween do with line-up changes?
Despite a somewhat tepid response to the album, Helloween nonetheless completed a successful world tour.
Was the band Helloween's music affected by the line-up changes?

Question: Did the new members struggle?
Self-contained rewrite: Did the new members of Helloween struggle?