More or less this. The other option is to take a gamble on some players - headcases like Balotelli, injury-stricken goalscorers like Rossi, Premier League castoffs like Vela, etc. who have all done better in La Liga and/or Serie A, and carry with them certain risks. Or you pay way over the odds (on the basis of what they've achieved so far) for young strikers and bet that they pay off, like for a Berardi, this Keita lad, etc. The risk is just as great as the former I think.
So a cheap buy for a proven, albeit declining forward as an option isn't too bad as a lower-risk option - the thinking is probably along the same lines of bringing in Toure at CB last season. And then seeing what options open up in January or next summer - it could be we have a target but are just a bit unsure if we should go for him now or observe him for another half to a season more, e.g. someone young who is still developing, or someone returning from injury.