While DM1 tends to make a decision to stop asking questions and guess in easier games, surprisingly DM2 is more likely to make a guessing decision when the image complexity is higher (note the contrasting tendency of the coefficients in the last column of Table 2 for DM2).
similarly to DM1, once DM2 decides to guess (decided games in Table 2), the simpler the image the more likely the model is to succeed in picking up the right target object.