As for Germany's current form it is convenient to say that they are playing better because he is absent but it is also baseless because we have not seen this current side, with tournament preparation including Ballack. As big a change as Ballack being missing is the 5 o6r 6 weeks that they have been together preparing as a team, drilling their gameplan and improving collectively. It doesn't make sense to give Loew credit for making the best use of his players and then assume that he wouldn't be able to leverage his most experienced player to make the team better.
It's equally convenient to say that just because the team is good... his addition would automatically make them better. Just as there is addition by subtraction, there too can be subtraction by addition. Here we have a German team that essentially plodded it's way thru qualifying, was forced by circumstances to re-tool their game on the fly, developed a winning formula to complement the unique collection of talent and egos on the field, all conducted with a maestro's touch by Loew. You would have us believe that all of that is mere coincidental to and not a consequence of Ballack's absence.
You would also have us believe that Loew suddenly had the team "drilling their gameplan" after Ballack's injury... what they didn't have a gameplan to drill before? Or are you conceding that Loew had to re-write the script following the injury, thereby introducing a new post-Ballack gameplan? Of course the latter is obvious, no need to even debate. The team that emerged in the wake of Ballack's injury was more dynamic and creative, was faster on the break and better equipped with tactics to match their younger, fresher legs than the Ballack-led team.
Would Ballack make the team better or worse? Of course it's all speculation... but you don't put a Volkswagen engine in a Porsche body and start it in Le Mans expecting to win anything.