Piłsudski would have had something to say about it, one way or the other.
Certainly he would.
Of course, hindsight is always 20/20, but I have no clue how dire the situation of the Poles was in „Congress Poland“ in the years before 1914, nor in Austria- Hungary. In Germany, there was a strong opposition on part of the Poles in Poznania and West Prussia, less so in Upper Silesia - and little or none on part of the Mazurs, who were…Protestants, just like the Prussians of German ethnicity.
There was a similar situation with the Lithuanian-speaking people in the Memel area, since they were Protestants, too. Unlike the Lithuanians of Lithuania proper.
Political and ethnic loyalties are sometimes two different kettles of fish, often religion is an important factor; just look at Northern Ireland or the little Southern Jura region in Switzerland, where there were conflicts between Catholics and Protestants not so long ago…