In general, the second does not necessarily follow from the first. Blacklisting password "password" decreases the number of possible combinations, for example.

Using digits not necessarily mean that generated p@ssw0rd wi11 be more resistant against dictionary attacks. In fact 0, 1, 4, 5, 7 may be used as replacements for often used characters, so I won't be surprised if probability that random password matches some dictionary word higher for alphanumeric passwords than for just alphabetic.