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I think people will simply start playing Tower more often because of Solmyr. But I don't think anyone will replace Shakti/Galtran with these ressurrectors.
Even if Solmyr or Tant are a little overpowered, they will still be in line with already recognized overpowered heroes like Gosh, Shak, Kirya, etc.
But I repeat, to add variety to the game, and even in Dungeon, I suggest starting with a random hero for all castles, and then Dungeon won't be valued higher than most castles.
And for Tower, it's not really important who the starting hero is - so it will only benefit from this.
Castle will be slightly less popular, but there won't be that worn-out Valeska in every report.
Believe me, the overall balance affects things much more than these minor details like one player getting Kirya as a starting hero, and another getting Ufretin.