I can see where Martinez is coming from (in the press conference) we are out of the FA cup now, so only have the League and Europa to focus on and in the league he was using Eto'o as a "number 10" to use his words and Eto'o was behind Naismith and Barkley in that position.
I think it does leave us light up front, with only Kone and Lukaku as proper strikers and I think as fans we have been here before where we have sold a third choice forward in the window and then had two strikers injured, but it is difficult to get someone to come in, knowing they will be third choice, so I can only see a loan (like the Jese Rodriguez Story).
Ideally I think we need to sign someone for the Left Wing, who can also play in the centre of a front 3. We were linked with Andre Ayew from Marsaille before the window opened. His contract is up in the summer, so we may be able to get him cheap now
http://www.mirror.co.uk/sport/football/transfer-news/everton-prepare-january-swoop-marseille-4845995