Eddington's motives in conducting the observations were impugned, and even now the issue is not resolved. If Eddington's experiment was capable of distinguishing between GR predicted light bending and Newtonian bending, it was not excessively capable of so doing.
Yes, but that's another (much more difficult) question. Still, looking for Einsteinian bending and looking for Newtonian bending are in principle the same action.
Edited by Dr Adequate, : No reason given.